I use Kaspersky Standard. No bloatware, no crap, straight to the point. All the important modules like Application Control are present. Not a signel issue with compatibility, Windows Update, dtivers, whatsoever. I see many Defender's fanatics claiming Defender is the only true answer since it's built in, while everything else is garbage and brings compatbility issues
. Last time I had a buggish experience was 2015 BitDefender. Then BitDefender updated and I never had any issues. Then I used ESET and Norton for quite some time and never experienced slowdowns, compatibility issues or bugs. Now I use Kaspersky and my system runs as smooth as silk.
[SPOILER="FUN FACT"]I did experience issues with Microsoft Defender, such as slow file transfer, delay in opening applications, and several known bugs such as the threat history, quarantine bugs, Controlled Access Folder, and many more.[/SPOILER]