Buying EDR

Buyer's guide.

Evaluation criteria

EDR evaluation compares detection, coverage, performance, and response surface together. One axis alone (cheapest, biggest brand, fastest demo) produces bad picks. Score every candidate against the same four axes so the comparison is real.

• Detection content. Behavioural rules, ML detection, threat-intelligence integration per vendor. Catches the "demo looked great, missed real attacks" gap.
• Endpoint coverage. macOS, Windows, Linux, mobile support per OS. Mismatches create blind spots in production fleets.
• Performance impact. CPU and memory cost per endpoint. Excessive impact drives user resistance and shadow-IT workarounds.
• Response surface. Kill, isolate, rollback actions per incident. Supports incident response, not just detection.

Major options

The 2026 EDR market has narrowed to three vendors covering most enterprise deployments. Run a 30-90 day proof-of-value against the top candidates rather than picking from analyst charts; detection-gap discovery in production beats vendor demo every time.

• CrowdStrike Falcon. Market-leader option. Comprehensive coverage, premium pricing.
• SentinelOne. Competitive challenger. Similar capabilities, more competitive pricing.
• Microsoft Defender for Endpoint. E5-bundled option. Tight Microsoft ecosystem integration.
• Proof-of-value per vendor. 30-90 day POC against real production traffic. Catches detection gaps before purchase.

Integration

EDR alone is not enough. SIEM correlation, identity-provider auto-disable, ticketing and SOAR automation, CMDB feeds for asset context all turn EDR alerts into actionable incidents. Standalone EDR produces alerts; integrated EDR produces response.

• SIEM integration. Correlation feed per alert. Standalone EDR misses cross-source context.
• Identity provider integration. Auto-disable per incident. EDR detects; IdP locks the account.
• Ticketing and SOAR. Automated triage per alert. Matches modern IR practice.
• CMDB feed for asset context. Owner and criticality per host. Supports prioritisation.

Deployment

Deployment is its own discipline. Phased rollout (pilot, expanded pilot, production), per-region compliance handling, quarterly tuning of false positives and performance, per-rollout rollback plan. Without the rollback plan, every rollout is a one-way door.

• Phased rollout. Pilot, expanded pilot, production per phase. Catches deployment issues before fleet-wide impact.
• Per-region considerations. GDPR-compliant data handling per region. EU endpoints need explicit treatment.
• Quarterly tuning. False-positive review, missed cases, performance impact per quarter. Continuous operations.
• Rollback plan per rollout. Agent-uninstall script per rollout. Recovery path exists.