A few reasons. It's received wisdom that AMD are the good guys because in the Intel / AMD slog they are the underdogs fighting the good fight and bringing good affordable products to all vs intel who has historically behaved in a sleazy underhanded and anti-competitive fashion and when they bought ATi they moved ATi from a maker of shitty proprietary poorly supported pieces of shit to an open source friendly maker of acceptable GPUS.
Since Nvidia is the bad guy in that fight it would be handy if Nvidia was also badly supported buggy, inferior. The fact that Nvidia is actually more stable, well supported, and generally better is somewhat a fly in the ointment.
It's especially humorous when its coming from users of a permanent beta distro like arch where the kernel update process is that the new kernel is pushed extremely quickly after release. Expert arch users realize that means they are their own QA as far as out of tree modules. Actually stable distros express what is known to work as dependencies such that you trivially get something that is known to work when you press go. They also don't run the kernel release that was cut this morning.
Meanwhile users of arch derived distros, who may or may not claim to be running arch while believing their distro is ubuntu with faster updates yell that nvidia is broken when 6.3 doesn't work the day it was cut with nvidia using a driver that doesn't claim to support 6.3. The fact that this dependency is known but not encoded into arch packages isn't an Nvidia problem.
Even Manjaro a distro run by folks who once told their users to set their clocks back because they forgot to renew their SSL Cert figured out they can avoid almost as much trouble as smart people can avoid by actually reading by just being lazy and not pulling changes instantly.
If you don't know install a distro and use what comes with it by default and only worry about digging into the plumbing if something doesn't work for you.
Ideally you let your distro worry about plumbing.
I think Mint is nice if you don't need bleeding edge stuff. You can use Cinnamon which runs x11 but will eventually support Wayland.
I've heard good things about suse which has a rolling release option and supports gnome and KDE under Wayland.
Arch of course is a thing if you don't mind a manual transmission as it were.
Personally I might pick Mint to get started.