The Vita has a better position in the handheld market than the Wii U in the home console market:

Market share of the Vita 2014 (so far): 24.7% (1081k of 4381k handhelds)
Market share of the Wii U 2014 (so far): 11.1% (1016k of 9117k home consoles)
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Nintendo is king of the handheld market and Sony is king of the home console market this year, but Sonys handheld share is much bigger than Nintendos home console share:
Market share of Sony handhelds 2014 (so far): 33.9% (1487k of 4381k handhelds)
Market share of Nintendo home consoles 2014 (so far): 14.3% (1303k of 9117k home consoles)










