I had this debate with myself a while ago and chose the PS Vita. I don't regret it 1 bit.
In the end it depends on personal taste in games, but buying the Wii U right now really holds extremely low benefits, I mean nobody here can seriously say the Wii U is the best for games right now...
$99 for Xbox 360 4gb game system with Kinect, when you buy Entertainment for all plan with 2-year Xbox LIVE gold Membership at $14.99/month.
B1G1 40% off ALL video games. (Over 775 to choose from!)
B1G1 40% off ALL Skylanders Figures & Accessories.