Since getting my iMac, I've used Safari exclusively on this machine, as it works on every site I go to.
On my old Windows machine FireFox was my browser of choice.
Maybe I'm just too lazy to download FF onto my iMac, but I prefer to think I simply don't need it and certainly don't want extraneous clutter on this iMac.
Good luck with whatever you decide on.
Morod
There have been many threads on this topic, below is a pretty long one that a lot of replies that may answer your question.
https://forums.macrumors.com/threads/440594/