I’ve gone between a few but on desktop it’s Librewolf. Just like Firefox but more privacy by default. On Android I’ve tried Fennec, Brave, Iceraven, and Mull. Out of all of them Iceraven has been my favorite simply because of its support for desktop extensions.
I’d love to use Gnome Web (Epiphany I think), it’s just not there yet. Maybe I’ll try it again when the next update releases. Currently still on Firefox.