Nintendo, because of 1 year head start.
Exclusives with a Metacritic over 80. (Exclusive = not on another system, no special Wii-U editions or HD remakes)
WiiU (6): Super Mario 3d World, MK8, Pikmin 3, New Super Mario Brothers U, DKC:TF, Lego City Undercover
Xbox One (1): Forza 5
PS4 (2): Infamous SS, Resogun
Did I forget anything?