.Why not just get a Wii U and then get the PS3 version of Xrd? Do you not have a PS3?
If you don't have a PS3 and you're looking between a PS4 or Wii U, I'd say go for Wii U. Cheaper, don't have to buy an arcade stick, and you have some pretty good first party games available.
Edit: Oh, in that case, I'd just say get a Wii U. I wouldn't get a PS4 just for Xrd (right now), personally.