First year, Wii U easily.
I think the second year will be very tough. The second year for Wii U had some gems, but quantity was a major issue.
Year 3 though... I think it's going to swing back in the Wii U's favor. This year I am expecting many great things from Wii U. The quantity seems to be good, they just need the usual quality to push it over the hump. But most of the must have games being first party, I think it can achieve it easily. A lot is going to ride on the quality of Zelda (easy win), Xenoblade X (a little worried about there being SO FREAKING MUCH the performance is going to take a hit), Splatoon (new team), Devil's Third (Nintendo needs a third party to knock one out of the park), and an awesome Star Fox (come on giant space battles!), ect. We shall wait and see.