Native windows for gamepass and wider game support/compatibility is the answer I bet you’ll find the majority of the time. I have the deck and the rog ally so I can play destiny 2 because of anticheat that prevents it running on the deck, gamepass ease of use instead of cloud gaming only and battlenet for diablo4 (though that’s on steam now). I tied dual booting windows on the deck but I wasn’t thrilled with my experience