X1. WiiU got the better exclusives by a very long shot, but X1 have 3º party games covered, that said:
All Nintendo exclusives < All 3ºparty that you just can't play on WiiU, Xbox one wins on my book, for sure.
Prediction: In 5 years Nintendo will Lauch a "Core Mario game" very similar to Astro Bot. That said, many will Ignore Astro Bot existence and say Nintendo created this concept.