SteamOS, at this point, is not officially supported outside of select hardware (Basically, Steam Deck and other handelds), so while it is prominent and talked about - it may not be the best choice for home PC usage.

As @chortle_tortle@mander.xyz said already: Bazzite is probably the closest equivalent, it also has gaming optimisation, but a more fully-fledged Desktop experience along with it. There are other gaming focused distros (e.g. Garuda, PikaOS) as well, but if you are prone to choice anxiety, just go with Bazzite - and check the others out if you get sucked down the "I want to tinker more with my system and try out more, different Linux flavours" pipeline later.