Rayman Legends on XO
Rayman Legends on Wii U
My Comparison
Graphics - Graphically you would be hard pushed to see 'any' difference in the two
= Tie
Controls - It just feels wrong with the xbox 1 controller. There is a noticeable micro delay between button press / analogue movement and actual on screen response. Likewise the sections where 'Murphy' helps out are clumsy on the xbox one and the rotating of platforms in the Murphy sections again require far more finger dexterity needed than the challenge is actually difficult.
The Wii U version works so much better be it with gamepad or controller. The gameplad response is better there is no delay which is important in such a twitch heavy platformer. Likewise the Murphy sections were clearly designed for Wii U and work and perform SO much better on Wii U.
= Wii U win
Loading
A bit of a bug bear in the Wii U version where loading levels can take anything between 20 & 30 seconds - and likewise navigating menus. Whereas on the Xbox One there really is no loading time for levels. You jump straight in. That is its biggest benefit.
= XO win
Conclusion - despite the boost in loading - the fact that the predominant gameplay feels so much better on the Wii U makes this a victory for the Wii U version.
If you have a Wii U & PS4/XO - just get the wii u version / no compelling reason to own both unless your mad as me.