Why would you buy a switch now when a more powerful one is coming out in a matter of months?
But yeah I have pretty much all the games, the one's I play the most are:
Mario Odyssey
Zelda
Hyrule Warriors (you either love or it or hate it)
Valkyria Chronicles (same)
Mario Tennis (this is a maybe, I play it in "simple" mode)
Splatoon 2
But smash is what i'm waiting for the most.
I have other games like Octopath traveler but i haven't played them yet