For the proprietary ones, Nvidia is still better in my experience on a Gentoo system where most everything else is from source. This Gentoo system started with

For the proprietary ones, Nvidia is still better in my experience on a Gentoo system where most everything else is from source. This Gentoo system started with Nvidia in 2009, was AMD in 2013, and this year is back on Nvidia now. AMD's old driver wasn't too bad and mostly an Nvidia-like experience with setup and stability, but after AMD's somewhat recent driver overhaul their proprietary one is a lot worse than it used to be, lacks many features or even a configuration UI, and worst it's required if you want an up-to-date X on your system. I also tried the open source AMD driver, which was its own pain (and the procedure wanted to bloat my kernel a lot) and didn't work in the end.