Microsoft Defender for Business vs Microsoft Purview Audit comparison

Microsoft Defender for Business is a new endpoint security solution that was designed especially for the small and medium-sized business (up to 300 employees). With this endpoint security solution, your company's devices are better protected from ransomware, malware, phishing, and other threats.

The unified auditing functionality in Microsoft 365 provides organizations with visibility into many types of audited activities across many different services in Microsoft 365. Advanced Audit helps organizations to conduct forensic and compliance investigations by increasing audit log retention required to conduct an investigation, providing access to crucial events that help determine scope of compromise, and faster access to Office 365 Management Activity API.