Busted on 14 June 2014
This is a pointless question as i don't see what relation the Xb1+Wii U combo have with the 3DS so i'll asume it's just out of curiosity ^^ - The answer is: They'll be very very close
Aprox. Numbers (+/- 5 000 000 margin):
Wii U: 26 000 000
Xbox One: 45 000 000
Nintendo 3DS: 71 000 000
(Those are all Best Case Scenarios for each platform individually)
