For me it depends on open tabs: with modern firefox 4 digit number of open tabs on a 64GB machine is no problem. Chromium crawls to a halt at low 3 digits.
I've been satisfied with Firefox speed for several years, ever since Chrome manifest version 3 crap started to become reality.
I keep many browsers on my laptop and use whichever one I must for in-compatibility reasons and primarily Firefox which makes me generally a happy camper. Mac os.