I don't it fair to compare the two. The Vita is a handheld device that can be use as a substitute controller and the Wii U GamePad is...a controller. It's like comparing an iPone to a 360 controller. Like the 360 controller, The GamePad is reliant to the Wii U console. And just like an iPhone, the Vita is a device to itself. Besides, Vita as a controller is not practical, especially with a small analog sticks.
Wii U Demos in *FPS* View ;)
http://www.youtube.com/user/PxDxI







