Usually for (serious) gaming most people prefer PC and for gaming its propably the better platform regarding price and hardware (and upgrades) as well availability of games and so on.
But of course that also totally depends on which kind of games you are interested in most.
Also I would not really recommend switching platforms just for gaming - I know how much I crige whenever I have to fix some issue for friends ok their Macs and can't imagine it's any different in the other direction.
Thing about Mac is. Whilst it does run the games that fit it way better then PC games. A Mac often has lag issues. As with me being a Mac user. Mac works better on browser and Editing. Whereas it lacks with Steam and other game buying sites as Mac is hard to make a game for and the developement for its games are made on PC. Making Mac the worst choice for Gaming with steam and big games.