MDR vs. MSSP: An Honest Comparison

SENTRY — MDR vs. MSSP

MDR vs. MSSP: An Honest Comparison

The two terms get used almost interchangeably in vendor marketing. They shouldn’t be. The real difference comes down to one question: when something bad happens, does the provider tell you — or stop it?

The Core Distinction

Alert Forwarding vs. Active Response

MSSPMDR
Core jobManage and monitor security devices; forward alertsDetect, investigate, and actively respond to threats
What you buyTool management and alertingAn outcome: threats contained
Incident responseTypically notifies you; you actRemote containment and mitigation included as standard
Staffing modelVaries; often tiered helpdesk-styleGartner requires 24×7 human-led monitoring and threat hunting
Engagement depthOften reactive, ticket-drivenDaily engagement with customer telemetry
Best fitOrgs that want tools managed and want to own responseOrgs that want detection and response as one outcome

Per Gartner’s Market Guide framing: MSSPs help manage and monitor security devices, while MDR providers deliver remote incident response as a standard part of the service — the buyer purchases an outcome (“threats stopped”), not tool management. The 2025 Gartner requirements for MDR specifically call for 24×7 human-led staffing, immediate remote mitigation beyond alerting, and daily engagement with individual customer data.

Why This Distinction Matters to Your Buying Decision

The terms get blurred deliberately in vendor marketing because “MDR” tests better than “MSSP” — so a lot of alert-forwarding services now market themselves as MDR without the response capability to back it up. The way to tell the difference in a sales conversation is simple: ask exactly who takes action when a real incident fires at 2 a.m., and what they are contractually allowed to do without waiting on you.

Armorstack doesn’t use either label for itself. We operate as a Managed Intelligence Provider (MIP) — a category built specifically because the MSP/MSSP split leaves accountability gaps between IT and security vendors. See our MDR vs. EDR vs. XDR page for how the underlying tooling relates to the service layer described here.

Frequently Asked Questions

Can a provider be both an MSSP and offer MDR?
Yes — many providers layer MDR-style response on top of an MSSP’s monitoring base. The label matters less than the specific contractual commitment: what response actions are included, and how fast.
Is MDR always more expensive than MSSP?
Generally yes, because active response requires more staffing depth and authority than alerting. See our MDR pricing page for the specific cost drivers.
Does Armorstack sell MDR?
Armorstack SENTRY includes MDR-level detection and response as part of its converged security operations — remote containment by Armorstack-employed analysts, not a subcontracted seat.

Find Out What You’re Actually Buying

Bring us your current contract or a quote you’re evaluating. We’ll tell you plainly whether it’s MDR, MSSP, or something in between.