personally, if DS2 came out on the Wii U I'd buy it.
I wouldn't otherwise. Regardless of whether or not I owned the console it was on.
I don't really know why either. Maybe it's because I'm in the 'support Nintendo' mindset, maybe I'm more prepared to be more experimental with the games I play on Nintendo consoles, maybe I prefer playing harder games on my Nintendo consoles, maybe it's that (from my understanding of the game) the gamepad appears to be a near perfect fit for the franchise... I'm not sure.
I just know that I have a 360, I'm planning on getting a PS4 next year; and I have absolutely no intention of getting DS2 on either. But if it came out on the Wii U I'd snap it up in a shot.
Just like I'm planning on getting Bayonetta 2, despite not properly giving the first one a go (in fact I played the demo and didn't enjoy it). But that's more likely because I had so much fun with Wonderful 101 I want to play more of Platinum's games.