SIEM vs XDR vs MDR: Which Detection Stack Fits — 2026

SIEM vs XDR/MDR: the real difference, when to pick each, and the top tools compared on live data.

SIEM, XDR and MDR all promise threat detection, but they differ in how much you build versus how much you buy.

SIEM vs XDR/MDR in one line

SIEM (Security Information & Event Management) ingests logs from everything and lets you write detections and run investigations. Powerful and broad, but it’s a platform you tune and staff.

XDR/MDR narrows the scope to vendor-correlated telemetry (endpoint, identity, email) and — in the MDR case — adds a managed SOC. Faster to value, less to tune.

Choose SIEM if…

you have compliance log-retention needs and a team to build detections and chase alerts.

Choose XDR/MDR if…

you want detections that work out of the box and, with MDR, someone else watching them 24/7.

Leading SIEM tools we track

Best SIEM pick: Wazuh — 8.3/10, from $571/mo (Cloud, up to 100 agents). See best siem software.

Leading XDR/MDR tools we track

Best XDR/MDR pick: Huntress — 8.6/10, on custom-quote pricing. See best mdr / xdr software.