Valve has confirmed that it is working on bringing SteamOS support to rival handheld devices like the ROG Ally. Dual booting into Windows on the Steam Deck is still far away, though.
I’ve used ChimeraOS a while back. From what I heard Bazzite should be on a similar level to SteamOS, so if you’re okay with the limitations of a Steam Deck and just want that on your PC then you might want to try Bazzite. That being said that’s an OS for a PC that will be a console, just like SteamOS, it’s not a general purpose Linux and you might get issues trying to do day-to-day stuff on it.
Also I don’t know how you install mods, if it’s via steam workshop they should work flawlessly, if you need something else you might have to jump through some hoops to get it, but again it’s the same hoops you would need on SteamOS.
I’ve used ChimeraOS a while back. From what I heard Bazzite should be on a similar level to SteamOS, so if you’re okay with the limitations of a Steam Deck and just want that on your PC then you might want to try Bazzite. That being said that’s an OS for a PC that will be a console, just like SteamOS, it’s not a general purpose Linux and you might get issues trying to do day-to-day stuff on it.
Also I don’t know how you install mods, if it’s via steam workshop they should work flawlessly, if you need something else you might have to jump through some hoops to get it, but again it’s the same hoops you would need on SteamOS.