SteamOS is based on arch linux, and I joke that when someone merge a pull request on github, Arch starts to build their package.

EndevourOS is basically arch linux for beginners, they have their own repositories but just for some tools, just cool stuff.

About Manjaro I would recommend to not use it, not because of the reasons' ppl common raise, for me, it was actually good when I used it, but they try to be "stable" as PopOS in their default branch, so you will never get the latest stuff.

I don't like Nobara because it is based on Fedora, a semi-rolling-release distro, so some packages don't update regularly and wait until next release, they probably update everything related to graphics and games but I do not only play games on my machine, I never used Nobara tho.

Said that, I play a lot more than I should, and I use EndevourOS.