PC for most games, but I also use it for most things in general
Steamdeck for any mid-tier games that can run on it well, or games that i'll be playing while also doing other things. Also for portability
Switch for better portability if the quality will be more or less the same, since it's lighter, smaller, and doesn't heat up much/at all. But also pretty much strictly for portability. If I plan to use it on a screen i'll use steamdeck.