EDR Is Not Enough: You Still Need Antivirus

The Contrarian Case for Keeping Antivirus

Everyone's telling you to rip out antivirus and go all-in on EDR. They're wrong. I've seen too many teams assume EDR is a silver bullet, only to drown in alerts from commodity malware that a simple signature check would've killed instantly. CISA's guidance is blunt: antivirus is prevention-focused, matching known signatures, while EDR is detective, using behavioral analysis and heuristics. They're not substitutes—they're a tag team. And with malware-free attacks hitting 82% of detections in 2025 (CrowdStrike 2026 Global Threat Report), you might think signatures are dead. But that's exactly why you need AV: to filter the noise so EDR can focus on the stealthy stuff. My recommendation? Keep AV as your first line, and let EDR handle the sophisticated threats that slip through.

The Threat Landscape Has Changed—But Not the Way You Think

The numbers are scary, and they're getting scarier. In 2025, average breakout time—the time from initial compromise to lateral movement—dropped to just 29 minutes (CrowdStrike 2026 Global Threat Report). That's faster than a lunch break. Meanwhile, IBM's Cost of a Data Breach Report 2026 puts the average breach at $4.99 million, a 12% jump. And AI-enabled attacks are skyrocketing: an 89% increase in 2025 alone, according to CrowdStrike. But here's the twist: the Verizon 2026 DBIR says more breaches now start with exploitation of software vulnerabilities than with stolen passwords. So while everyone's panicking about AI, the real vector is unpatched software. That's why you need a layered approach—AV for the known, EDR for the unknown, and patching for the rest. Don't put all your eggs in one basket.

Meet the Contenders: CrowdStrike Falcon, Microsoft Defender, SentinelOne

I'll cut to the chase: the three EDR tools I'd actually stake my reputation on are CrowdStrike Falcon, Microsoft Defender for Endpoint, and SentinelOne Singularity. These are the big names you see in every vendor bake-off, and for good reason. But they're not interchangeable. CrowdStrike is the cloud-native speed demon with a massive threat intel feed. Microsoft Defender is the budget-friendly option that integrates with everything if you're already in the Microsoft ecosystem. SentinelOne is the autonomous choice, with a focus on AI-driven response. Let's break them down on the criteria that actually matter.

Head-to-Head: Detection, Response, Ease, Cost

I'm comparing them on four criteria: detection capability (how well they catch modern threats), response features (what they do after a hit), ease of deployment and management (can your team actually handle this?), and total cost of ownership (including licensing and staffing). Here's my honest take, based on the fact base and years of watching this space.

No tool is perfect. CrowdStrike's pricing can give you sticker shock, but its threat intel is top-tier. Microsoft Defender is a steal if you're already paying for E5, but its depth is tied to the Microsoft stack. SentinelOne's autonomous response is impressive, but you'll need time to configure it properly. My advice: if you're a small shop with limited budget, go with Defender. If you're a larger enterprise with a dedicated security team, CrowdStrike is worth the premium. SentinelOne is the balanced middle ground, but don't expect miracles out of the box.

Who Should Choose What

For small businesses and mid-sized companies that don't have a dedicated SOC, I'd steer you toward Microsoft Defender for Endpoint. The integration with Office 365 and Azure AD reduces friction, and the cost is often bundled into your existing Microsoft licensing. You get solid EDR without a separate bill. For larger enterprises that need to stop sophisticated intrusions fast, CrowdStrike Falcon is my pick. Its breakout time and threat research are unmatched, and the ability to roll back malicious changes is a lifesaver. For those who want to minimize manual intervention and trust AI to do the heavy lifting, SentinelOne is the one. It's perfect for lean teams that can't watch every alert. But remember: regardless of which EDR you choose, you still need antivirus running alongside (CISA).

The Bottom Line

Don't let anyone convince you that EDR replaces AV. They're complementary, and the evidence is clear. But if you're in the market for an EDR, start with CrowdStrike Falcon if you can afford it, because it has the best detection and response capabilities for modern threats. That's my recommendation, and I'm sticking to it. The single most important thing to remember: your endpoint security is only as good as your patching and backups—EDR is just a safety net.

Sources

• CISA - https://www.cisa.gov/stopransomware
• CrowdStrike 2026 Global Threat Report - https://www.crowdstrike.com/en-us/global-threat-report/
• IBM Cost of a Data Breach Report 2026 - https://www.ibm.com/reports/data-breach
• Verizon 2026 Data Breach Investigations Report - https://www.verizon.com/business/resources/reports/dbir/
• MITRE ATT&CK - https://attack.mitre.org/