Interesting you say that about Windows 11 because I have cold feed. I know there was an issue downloading Bitdefender on my daughter's Windows 11 laptop and I don't what that headache. Hopefully it's a thing of the past now.
Thanks for the feedback...
https://www.av-test.org/en/
Meanwhile, there are few reasons to choose an anti-virus solution other than Microsoft defender, as AV Test's long-term tests show, and virus scanners have always caused problems, sometimes one, sometimes another.
I use on 4 of my 5 computers, Defender and on my main computer F-Secure, only on my main computer I have a problem with a certain software that cannot establish a secure connection as long as I have F-Secure installed, with Defender this problem does not appear.