Prediction: PS Vita > WII U Total Lifetime Sales ( worldwide )

[Miyamotoo]

Vita is Yoy down, Wii U is Yoy up.
http://www.vgchartz.com/article/259097/2015-year-on-year-sales-and-market-share-update-to-march-28/

Also, last year for same date Vita was around 2.2m ahead of Wii U and now are around 800k.
Like I said, Wii U in holiday time have 2-3x bigger boost in sale than Vita.