Advice Request Why Do You Use Windows Defender Antivirus?

Please provide comments and solutions that are helpful to the author of this topic.
I am curious if anyone tested free AVs against PUAs (PUPs)?
Part of the problem is there is no clear definition of a PUA/PUP. Some AVs consider everything illegal to be PUA. Others consider everything a little bizarre to be PUA.

Avast always said Great--No Threats found after scans with that program
Avast has a user-friendly definition of PUA. I like it.