Well we got france numbers on HHs in 2014. VGC has vita+3ds at 902k while official numbers put it at 848k. Of course it could and most likely is 3ds being overtracked by 50k-80k but that just means vita didnt sell as much in France.
This only goes for 1 country in Europe, but it is one of the 3 biggest there (for HW Sales)