Which is better?

If you get the Wii U bundle you can get another free game with it. It's also most likely cheaper than the rest unless you get an extremely low budget PC(which probably wouldn't handle games well). Also, in my opinion Wii U has the best exclusives :b

Skyrim

Get the Wii U +eshop cards. Mario Kart 8 is going to be super awesome, and you get a free game with it as someone above posted (I'd get inder Waker HD but that's just me XD ). Not to mention the new Super Smash Bros!