Linux

It all depends on games you play. Talking about singleplayer: a good mount of games run natively and those which don't usually can be played with Proton. Valve did a great job and nowadays you can run almost anything (although once in a while a little bit of tinkering is required). The only problem that you can stumble upon is unticheat. Basically just check if your favourite games are playable or not here and than decide whether linux gaming is for you.