In terms of just games, disregarding exclusivity and stuff, I'll say 2011.
Skyrim, Portal 2, Arkham City, Forza 4, Gears of War 3, and Deus Ex Human Revolution.
Bet with Intrinsic:
The Switch will outsell 3DS (based on VGchartz numbers), according to me, while Intrinsic thinks the opposite will hold true. One month avatar control for the loser's avatar.