For the next-gen upgrade, Game Collection currently have the the cheapest pre-order price. For your money, you'll be getting improved graphics and reduced loading times. On PS4, the DS4's trackpad will get involved and remote play with the Vita will be supported, although it doesn't sound like you'll be able to use the Vita to replace the functions of the Wii U's gamepad screen (why?!). Xbone players will get ten exclusives challenges. You can pick up the PS3/360 versions for half this price, but this does look tempting.
Rayman Legends is out on PS4 and Xbox One February 21st.