There's no particular distro preference. If you can install Steam on it, Proton is also likely to work. Steam's SteamOS is Arch based (btw), used to be Debian based. Steam games used to target Ubuntu, I can't find the sources for this, but I remember seeing it as a target. LTS versions usually.

I personally had good experience with either Mint Cinnamon, Debian (with KDE), Fedora and Manjaro, so it's pick your poison, really. For support reasons, I suggest a popular distro.