NVidia proprietary drivers are slightly less terrible than AMD's but basically unusable on laptops. Desktop is a far smaller niche. There is nobody that is getting these bugs fixed in distros in a timely fashion, because NVidia doesn't care about laptops and distros don't care about proprietary drivers. See eg this 2+ year old unfixed bug in Ubuntu: https://bugs.launchpad.net/xorg-server/+bug/1220426 (hundreds of comments and subscriptions)
AMD open source drivers are on the other hand are pretty stable and work quite well for things like WebGL, light gaming etc.
I have a laptop with optimus and it works like a charm even in steam using primusrun.
For non gaming stuff it is using the intel gpu.
All I had to do was install 2-3 packages in arch linux and that was that.
I haven't had any crashes in linux due to nvidia in many years either so I'd say that the proprietary drivers they have are stellar.
I'm a big open source advocator, however I will use what works and for me nvidia is light years ahead of amd when it comes to linux, sad as it is.
Funny, Nvidia's binary drivers have given me the only consistently good experience I've had on Linux laptops. AMD's binary drivers have been absolutely atrocious and the open source drivers (until recent years?) didn't have enough features and enough power savings to sway me.
Good point about laptops, I didn't consider the Optimus mess. That said, when we're talking about gaming cards I'm not sure that desktop is a niche compared to laptops.
AMD open source drivers are on the other hand are pretty stable and work quite well for things like WebGL, light gaming etc.