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!)

I like that they both have vertical tabs now.