EDR vs XDR vs MDR is usually framed as a technology question. For a mid-size enterprise it’s a staffing question. All three can catch the same ransomware operator. The difference is who looks at the alert at 2am, what data they can see when they do, and whether anyone has the authority to isolate a laptop before the attacker moves sideways.
So we’ll skip the vendor feature grids. This guide defines each model, compares them on what decides the outcome (data sources, who operates them, running cost), and maps them to three realistic team shapes. If you’ve already read our comparison of SIEM, MDR and an in-house SOC, this piece fills in the endpoint and XDR half of the picture.
EDR vs XDR vs MDR at a glance
Here’s the side-by-side version. Two of these are products. One is a service. That distinction matters more than any line in a datasheet.
EDR
- What it is: Technology (agent plus console)
- Data sources: Endpoints: processes, files, registry, network connections on each device
- Who operates it: Your team
- Response actions: Isolate host, kill process, quarantine file
- Main cost driver: Per-endpoint licences plus your analysts’ time
- Best fit: Teams with at least some analyst time during the day
XDR
- What it is: Technology (platform)
- Data sources: Endpoints plus identity, email, cloud, network and sometimes third-party logs
- Who operates it: Your team
- Response actions: Same as EDR, plus disable accounts, pull emails, block across tools
- Main cost driver: Platform licence plus your analysts’ time
- Best fit: Teams with a small SOC that want fewer consoles
MDR
- What it is: Service (people plus tooling)
- Data sources: Whatever the provider’s stack ingests, usually EDR at minimum, often XDR or SIEM
- Who operates it: The provider’s analysts, with your team for approvals and remediation
- Response actions: Provider triages and often contains; you own the business decisions
- Main cost driver: Service subscription in place of most analyst hiring
- Best fit: Teams without 24/7 coverage or security analysts
Read the “who operates it” line twice. EDR and XDR don’t watch themselves. If nobody triages the alerts, you’ve bought a very expensive log of what happened.
What is endpoint detection and response (EDR)?
Endpoint detection and response is an agent on each laptop, server and (sometimes) mobile device that records detailed behaviour and flags activity that looks like an attack. It watches processes spawning, scripts running, files being encrypted and connections leaving the device, then lets an analyst isolate the machine or kill the process remotely.
That last part is what separates EDR from traditional antivirus. Antivirus asks “is this file known to be bad?” EDR asks “is this sequence of actions what an attacker does?” A PowerShell script launched from a Word macro that then reaches out to an unfamiliar domain might involve no known-bad file at all. EDR still catches the chain.
EDR has a prerequisite people skip: you need to know which devices you have and be able to push an agent to all of them. Unmanaged laptops are blind spots. That’s why we treat device management as step one, and our guide to endpoint MDM and device security covers how to get enrolment above the level where EDR coverage actually means something.
A quick caveat. EDR only sees endpoints. A stolen password used from an attacker’s own machine to log in to your email never touches a device you manage. EDR won’t see it.
What is extended detection and response (XDR)?
Extended detection and response takes the EDR idea and widens the data. An XDR platform pulls in telemetry from endpoints, identity providers, email, cloud workloads and network sensors, correlates it, and presents one incident instead of five disconnected alerts. Gartner’s Market Guide for Extended Detection and Response describes XDR as delivering “unified threat prevention, detection and response capabilities for security teams.”
The practical win is correlation. Picture a phishing email that lands, a user who clicks, an odd sign-in from a new country, and a process on their laptop that starts touching file shares. Four tools would give you four alerts at four severities. A good XDR stitches them into one storyline with one priority.
You’ll hear about two flavours. “Native” XDR means one vendor’s products feeding one console. “Open” XDR ingests third-party tools too. Native is simpler to run; open suits a mixed-vendor estate you don’t want to rip out.
XDR is still a tool your team operates. It reduces alert volume and investigation time. It doesn’t remove the need for someone to investigate.
What is managed detection and response (MDR)?
Managed detection and response is a service. A provider runs the detection tooling (often their own EDR or XDR stack, sometimes yours), monitors it with their analysts, investigates what fires and either contains the threat or tells you exactly what to do.
What you’re really buying is people and hours. The honest arithmetic: one seat staffed around the clock is 168 hours a week. At a 40-hour week that’s 4.2 people before anyone takes leave, gets sick or goes to training. Very few mid-size companies can justify that for security monitoring alone, and fewer can hire and keep those people.
MDR contracts vary a lot. Some providers only notify you. Others will isolate a host or disable an account on their own authority, within limits you agree in advance. Ask these questions before you sign:
- Which response actions can the provider take without calling us first?
- What data sources are in scope: endpoints only, or identity, email and cloud too?
- How quickly does a human, not an automated ticket, contact us for a high-severity incident?
- Who owns the detection rules, and do we keep them if we leave?
Choose by team capacity, not the feature list
Every vendor can demo stopping ransomware. None can demo your own team at 11pm on a Saturday. Start from that.
Our post on SIEM and managed detection and response covers the SIEM, MDR and in-house SOC trade-offs in detail. Here’s how we’d frame the EDR vs XDR vs MDR choice by team shape.
No dedicated security staff
IT generalists handle security alongside everything else. Buy MDR, and make sure it’s built on real EDR with host isolation. Buying EDR alone here usually means alerts pile up in a console nobody opens.
Two or three people who own security
You can run EDR or a native XDR during business hours and do a good job of it. The gap is nights and weekends. Two common answers: an MDR provider for out-of-hours coverage, or a co-managed arrangement where the provider handles first-line triage and escalates to your team. Pick XDR over plain EDR if identity and email attacks are your main worry, which for many Microsoft 365 or Google Workspace shops they are.
An existing SOC or security operations team
You likely already run a SIEM. XDR can cut the noise your analysts wade through, and MDR might still make sense for overflow or specialist threat hunting. At this size the decision is about analyst efficiency, not coverage.
Our IT consulting and cyber security team runs the advanced threat protection side of this work: scoping EDR deployments, tuning detections and working out which parts you should keep in-house.
SIEM vs XDR: do you need both?
If you already own a SIEM, this is the obvious next question. The short answer: they solve overlapping but different problems.
A SIEM collects logs from almost anything (firewalls, applications, servers, cloud platforms, identity) and keeps them for search, correlation and compliance reporting. It’s broad and flexible, and it needs people to write and tune detection rules. CISA, working with Australia’s ASD’s ACSC and other partners, published guidance for SIEM and SOAR implementation in 2025, and one of its three documents is devoted entirely to which log sources to prioritise for ingestion. That tells you where SIEM projects tend to struggle.
XDR goes deeper on fewer sources, with detections the vendor builds and maintains, plus native response actions. It’s narrower but works sooner.
Our view: if you need long-term log retention for audits, or your crown-jewel applications don’t feed an XDR, keep the SIEM. If you don’t have a SIEM and your main risks sit on endpoints, identity and email, start with EDR or XDR and add a SIEM when compliance or scale demands it.
How SecureShield combines EDR, SIEM and a managed service
Plenty of mid-size teams would rather not pick a single column from that comparison. What they want is detection across endpoints and logs, with one partner accountable for making it work.
That’s the gap SecureShield is built for. It’s a managed Zero Trust service aligned to NIST and CISA guidance, organised as 37 modules across 7 phases and 20 critical controls. On the detection side it includes EDR with automated investigation and a cloud-native SIEM with a single SOC dashboard. Around that sit the controls that make detection useful: a cloud identity provider with SSO, MFA and privileged identity management, unified endpoint management for Windows, iOS and Android, and data classification, encryption and DLP.
We manage the implementation end to end, so it’s a service rather than a tool you install and run alone. Exactly which monitoring and response duties we take on for your environment (hours of coverage, which actions we can take without you) gets agreed during the assessment, so ask about it directly. It’s the same question you should put to any provider.
Where detection sits in a Zero Trust architecture
Detection and response is one of the feedback loops that makes Zero Trust work, so it’s a poor fit for a standalone purchase. NIST SP 800-207 describes Zero Trust as moving defences from network perimeters to users, assets and resources, with access decided per session. Those decisions are only as good as the signals feeding them, and EDR, XDR and SIEM are where many of those signals come from.
CISA’s Zero Trust Maturity Model makes the same point structurally. Version 2.0 lists “visibility and analytics” and “automation and orchestration”, alongside governance, as capabilities that cut across all five pillars (identity, devices, networks, applications and workloads, and data). Detection tooling is how you mature both.
In practice the order looks like this: manage your devices, lock down identity, deploy EDR, then widen to XDR or SIEM as your data sources grow. Our Zero Trust architecture implementation roadmap lays out those phases in sequence.
If we had to give one recommendation to a mid-size enterprise without a SOC, it would be this: get EDR on every managed device, make sure someone is contractually on the hook to respond around the clock, and treat XDR as the upgrade once identity and email signals are flowing.
Frequently asked questions
What is the difference between EDR and antivirus?
Antivirus mainly blocks files that match known malware signatures or simple heuristics. EDR records behaviour on the device over time, such as process chains, script execution and network connections, and flags patterns that look like an attack even when no known-bad file is involved. EDR also gives analysts remote response actions like isolating a host, which traditional antivirus doesn’t offer.
Do I need XDR if I have a SIEM?
Not always. A SIEM gives you broad log collection, retention and custom correlation. XDR gives you deeper, vendor-maintained detections and built-in response across endpoints, identity and email. If your SIEM is well tuned and staffed, XDR is optional. If your analysts are drowning in SIEM alerts, XDR can take over first-line detection while the SIEM keeps handling retention and audits.
Is MDR better than an in-house SOC?
It depends on scale and control. An in-house SOC gives you people who know your business deeply, but round-the-clock staffing takes more than four full-time analysts per seat. MDR gives you 24/7 coverage and specialist skills without that hiring burden. Many mid-size companies use MDR for nights and weekends and keep a small internal team for business hours and remediation.
Is MDR the same as SOC as a service?
They overlap heavily and many providers use the terms interchangeably. MDR usually implies the provider brings its own detection technology, often EDR or XDR, and takes containment actions. SOC as a service can mean the provider monitors your existing tools, such as your SIEM, without supplying the stack. Check the contract for data sources, response authority and rule ownership rather than relying on the label.
Can a mid-size company run XDR without a security team?
Technically yes, but it rarely works well. XDR reduces alert volume and speeds up investigations, yet someone still has to review incidents and approve actions. Without dedicated staff, alerts sit unread outside office hours. If you don’t have a security team, pair XDR or EDR with a managed service so a trained analyst is always responsible for responding.
Which should I buy first: EDR, XDR or MDR?
Start with EDR on every managed device, because it’s the foundation both XDR and most MDR services build on. Then decide who operates it. If you lack 24/7 analysts, add MDR straight away rather than later. Move to XDR once you want identity, email and cloud signals correlated with endpoint data in a single view.
Get a second opinion
Not sure which model fits your team? Schedule a security assessment with us. We’ll review your endpoint coverage, current tooling and staffing, and tell you plainly whether you need EDR, XDR, a managed service or a mix of the three.