I use Firefox on Android, it works pretty good. Having dark reader and uBlock Origin on mobile is a big plus. But I do hate the lack of configuration options, pull-to-refresh, and their need to 'approve' extensions and in particular not allowing any kind of sideloading of extensions. For this reason I can't use some of the extensions I like (because they won't allow them in the firefox store either). This is in particular one that bypasses paywalls. I assume the google deal has a lot to do with that.
I wish they would just charge for Firefox sync. The users that are left mostly use it for privacy reasons and they know that privacy costs money.
Safari is not an option for me, I use all platforms but I want the same browser on every platform which means no safari :)