The Wii U.
I think Nintendo fans really long for these kind of games (more so than the users of other platforms) and you guys can really complement to Nintendo's library, as you did during the SNES and N64 era. It just "feels" right. I think this is because you can provide that exact same "magic" Nintendo games have (as you have shown in the past). I also think you will get the 100% support and dedication of the Nintendo fans if you choose to do so, which could have opportunities in the future (long-term thinking).
That said, for the fans of the game itself, multiplatform would be the best option.