Linux gaming has gotten really good and continues to get better. Currently, I’d agree with what most of the other responses here have been and say Mint or Pop!_OS

This doesn’t help for the current build you’re setting up and I’m not suggesting to wait for it, but for the future I’d suggest also to keep an eye on SteamOS and when Valve eventually releases it for people to just download and install on whatever machine, it’s likely going to be the best option for this kind of scenario