Hardened Firefox is fine. I would recommend Librewolf though, it's just firefox already hardened for you.
Brave if you want something out of the box. Although, I would advise to change some settings. Go to shield settings and set "Trackers and ads blocking" and "Fingerprint blocking" to aggressive. I prefer ublock origin though.
For android, I recommend
Bromite - chromium fork with built-in adblocker and enhanced privacy. Easier to install if you have F-droid store installed on your Android device then add the Bromite repo
and/or
Mull - firefox fork with some hardening, installing ublock origin is recommended. Can also be installed from F-droid.
Hardened Firefox is fine. I would recommend Librewolf though, it's just firefox already hardened for you.
Brave if you want something out of the box. Although, I would advise to change some settings. Go to shield settings and set "Trackers and ads blocking" and "Fingerprint blocking" to aggressive. I prefer ublock origin though.
For android, I recommend
and/or