I'm not good at predicting, but I'm gonna go with Xbone. Just because the hype and (partly) Titanfall.

Don't know though.

Xbox One easily. So much in fact that I think it will overtake WiiU LTD sales this year.

XOne still launching in at least Japan and 8 remaining European countries in 2014, so European sales should get a bit better once that happens.

Yes I have. I also know that it will be released on the XB 360 as well. Same thing with most of the 3rd party games. The fact that XBO is $500 leads me to think that the people upgrading to play the superior versions will be less than most people believe.

@Everyone: Funny how so many votes are for Wii U yet all the comments are for the XBO. What's up with that? Anyway, Wii U has Mario Kart 8, SSB4, DKCTF, Yoshi, X, and others that'll surely be announced later. Miyamoto's new IP could be big as well but that's yet to be seen.

This isn't even up for debate. The X1 is gonna destroy the WII U even without halo 5 this year.

Xbox One easily, Wii U should do well though.

XBone will outsell the WiiU, but not by much. WiiU will most likely be on par with the Xbone once MK8 and Smash Bros 4 come out. 

X1 is easily going to sell a lot more. You have Titanfall and probably Halo 5 this year and at E3 they will probably announce Forza Horizon 2 and a bunch of other exclusives.

It could be close if smash and mario kart catch fire, but the safe bet is the x1 beating the wii u... Probably by a significant margin...

Why isn't it up for debate? 

Define "destroy" in your opinion please.

Probably Xbox one, but I think Wii U will be in the same ballpark.