think it comes down to personal preference really. Also, I'm not sure about the wii u but the ps4 is missing some games (e.g., Diablo III Ultimate Edition).
I own a ps4 and dont own a wii u yet would still give a slight edge to the wii u (mainly due to the ps4 having no stellar exclusives in the first year to my knowledge). That said, I know I would be happier in the long term with a ps4 than a wii u.
edit: actually, infamous SS was a pretty fun game but I still don't see it on the same level as a main entry into the mario series.