It's hard to compare the numbers since they launched at different times, but here are some aligned stats.
USA 58 weeks
Wii U: 2 million
PSVita: 1.3 million
Europe 57 weeks
Wii U: 1.1 million
PSVita: 1.6 million
Japan 56 weeks
Wii U: 1.5 million
Vita: 1.6 million
Again though this isn't a 1 to 1 comparison since they launched at different times. A different comparison is looking at their numbers post launch. April to Dec Vita did 2.629 million. Wii U did 2.356 million
Wii U seems to be going into its second year with a lot more promise than the Vita did, but launches aligned so far the Vita has actually performed much better.







