Used to be Opera (og, not GX) until it went to the hands of the chinese. Now its Brave mainly because the UI feels similar to that of Opera plus its built in ad-blocker is solid
Firefox. Just decided to try and eventually liked it because it gave me more personalization options than chrome. Don't know if it is really the case but rn I'm too lazy to switch back.
Vivaldi, it's nested/vertical tabs are just too good man. I used to just have a bunch of windows open when I used Firefox but now there is no need. Tonnes of really nice shortcuts too.