It will be close, but I'll go with Wii U, Splatoon was once more majorly sold out in Japan for its second week, so the game continues to have potential, Yoshi even though not that big, should help it to maintain itself. PS4 does have MGSV: PP in September, though the question is if it will be enough to eradicate any difference the Wii U put between the two. So with that in mind, I will say it will be close, but Wii U will shine at the end, though I do have to admit that with the Splatoon surprise, the Japanese market has shown to be a unpredictable one.
Well... there is one way I could say the Wii U would win for sure... Splatoon is Nintendo's game for the summer, so they are bound to release more commercials later on, and there is one trailer that they can use to make a hype-filled commercial to attract the market, and that is this:
https://www.youtube.com/watch?v=_PsBfxHrQHY
A commercial with that would seal the deal!
P.S also help with embedding that video :P
COMG guide to points: 1 point = Raging. 2 points = Beasting. 3 points = Tearing it up. 4 points = Berzerk. 7 points = Rampage. 12 points = Burst. 15 points = god mode. 20+ points = DIVIDING BY ZERO!!! 40+ points = Youkai (originally Pokemon).
-1 = Negabeasting. -5= NegaRampage. -10 = NegaBurst
