Tbh firefox performs great and works for me, and its issues can be fixed with extensions and settings, both on desktop and mobile. I never looked for anything else myself. I also like to use a browser that is not chromium-based, I do not want google to have the monopoly.

maybe I am just not picky, but if you need more privacy than what can be achieved with a hardened firefox config you might be better off using TOR at that point.