I dont know that its how they brand themselves, but Pop!_OS is a fantastic linux gaming distro.

Its based on Ubuntu, but they do several very important things: they update/patch the kernel with the latest drivers and goodness and provide the latest nvidia proprietary drivers. So you get the stability and durability of ubuntu + newer kernel support which means things like much more current mesa drivers (for radeon cards).

I've been using it full-time for 3 (or 4?) years now. I technically have my PC dual booting with Windows for gaming reasons, but since the steamdeck took off all of the big games I want to play are available on linux. I've logged into windows exactly 2 times and that was to run updates.

Pop has been rock solid and turned out to be a great gaming OS.