Given Final Fantasy XV's cinematic aspect, I honestly think it would perform better on Xbox One than Wii U sales-wise (not to mention the level of downgrading needed to get Final Fantasy XV to run on the Wii U, if that's even possible for their vision). But there's definitely an argument for Kingdom Hearts III (aside from their shaders that might not be as easily doable on Wii U, I dunno) . Kingdom Hearts has been on Nintendo and Playstation platforms quite equally, even if the major titles ownly appeared on PS, so I think that makes sense, but Xbox has never seen KH even once, not even the HD collections, so it's a little strange. So yeah Kingdom Hearts III makes more sense on Wii U than Xbox One for the most part, but I don't think that's the case with Final Fantasy XV.
Either way, both franchises are very closely tied to Playstation consoles, so if anyone is a fan of them like myself, then they'd likely be getting a PS4 anyway.
