I ran Arch for years, but I eventually realized I only really enjoyed Arch from a conceptual point of view.

The big plus for me is stability. I had a few major problems pop up after an update, and while I was able to fix them easily enough, It was still annoying that I had to do it. Fedora is nice and stable while not being too far behind.

The loss of the AUR wasn’t that annoying because Fedora has the advantage of being one of the main OS’s. A lot of developers treat it as a default

SteamOS-like distributions probably aren’t for you right now. nvidia has massively improved over the year but it’s still not on par with AMD.

Using an immutable distro (which Steam OS and its kind are) is just going to complicate things. Your easiest bet is using a distro that will install the correct drivers at install, like pop_os or mint.

If you want SteamOS there are plenty of options that are effectively the exact same thing but with a different name.