I would recommend Bazzite. It’s based off of Fedora Silverblue and it’s what I currently use. Very stable compared to the others that I’ve tried. Choose “Bazzite Deck” when you install if you want it to boot directly into Steam game mode.
There’s also ChimeraOS and Nobara Deck edition.
That’s just crazy talk. Crack some skulls and get Half-Life 2 out the door Mr. Newell. Everyone knows that you buy boxed PC games at the mall like normal people.