It is clearly worse, mbp 15 2017
I was able to use Big Sur for an hour or two with mild symptoms. It’s max 15 min for Monterey.
Fonts look worse, a step towards Windows.
On a plain fill, like Notes app, screen flickering is visible to the naked eye (it’s not so obvious with a photographic image).
Given amount of bugs Monterey has, it seems that it’s just a poor engineering.