Vita 20 million.
With no signs of Sony putting any effort in developing the Vita's market in NA and Europe, it's going to remain a novelty loved by PS and handheld fans only.
Wii U 35 million.
Though 3rd party is weaker than ever, Ninty's core franchises(Mario kart, smash) are better known. Has some good indie games and a major slice of the NFC gaming segment.
I predict NX launches in 2017 - not 2016