Used to use Norton security, but now I use windows defender 
Used to use Avira, but that is decades ago 
Now I’m using Windows Defender/Security Essentials on all my devices which need protection and never had a problem with it.
Personally, I use Kaspersky. 8)
By my mind it’s important to have a good antivirus. Tons of people nowadays just have a free antivirus, obviously not updated :o.
When I fix their pc and the antivirus update pop-up shows up I ask them “wut should I do?” and always, but ALWAYS >:(, they say “Just close it m8”. It’s a shame how people doesn’t know about viruses and how important is protecting your own pc. ??? :-\
I remember the similar topic some time ago.
As I see the dominant opinion about AV is in the contrary with opinion discussed in this topic.
What’s changed since then?
The people in the discussion.
I use kaspersky total security on windows.
Nothing on Fedora.