I'm a bit of a tinkerer with software and will occasionally "wander" over the fence to see if it really is greener on the other side; I always come back to Firefox. I've tried:

Brave: love the mission/execution, don't care for Chrome

Arc: interesting idea, but ultimately removed too much of the things I need in exchange for things I might use, but don't need

Orion: Firefox extensions (even on iOS!) + native performance? Love it, but it crashes all the time and the extensions' compatibility comes and goes

Safari: I don't mind paying for software, but paying for extensions that will probably disappear in 6 months is a pass

I've recently settled on the Zen Firefox flavor: It brings a lot of what Arc, custom Firefox themes aim for in a stable package, while maintaining full compatibility with all the Firefox extensions I use. The only issue I still experience is the occasional "this site only works on Chrome".