I don’t know what you do or do not know about Linux, but I’d highly recommend using a desktop Linux distribution instead, like Fedora, OpenSUSE, Debian, or Arch. Something with quick releases so you get new performance improvements and bugfixes quickly.
SteamOS in particular is really cool on a handheld, but would be kind of irritating to use on a regular laptop. It’s also immutable, which protects you from fucking up too bad, but also makes certain types to configuration way harder.
I love Arch, but don’t install it unless you want to learn how it works. Archinstall is quick and easy if you aren’t scared of the terminal, but it doesn’t hold your hand at all and you will break something if you don’t read the news or fuck about without knowing what you’re doing.