Brave's adblocker does a good job. As far as I know Firefox started using some of the Rust written components of that engine.
Interestingly on fingerprinting test websites, Brave also did significantly better than Firefox + PrivacyBadger + ublock Origin + one or two more which I forgot. When I ran some tests a couple months back.
Firefox was slow on my computer (old Thinkpad). I tried using Degoogled Chromium but it kept crashing. So the closest thing for me (Chrome minus Google) was Brave.
Vivaldi is cool (I loved Opera 20 years ago) but very laggy on my machine. (They did the UI in JavaScript or something.)
I use both now (Brave and Firefox), when I want to use a second account. And Firefox scrolls PDFs more smoothly. (But Chrome-based browsers have sharper text rendering in PDFs! Can't win 'em all!)
Interestingly on fingerprinting test websites, Brave also did significantly better than Firefox + PrivacyBadger + ublock Origin + one or two more which I forgot. When I ran some tests a couple months back.