It totally depends on the length of life of both.
And Christmas, i think christmas will be much better for Wii U and X1 will sell more for the rest of the year, every year, so it should be really close, you are too quick to say X1 will win, we cant know for sure.
But Wii U would need something casual to win because they already used their best card
Predictions for end of 2014 HW sales:
PS4: 17m XB1: 10m WiiU: 10m Vita: 10m







