In an ideal world, consumers would own all three consoles and many would find that their Wii U was, indeed, getting most of their play time. As it is, the only people with a chance to perform this kind of case study are the ones who've already purchased a U - i.e. Nintendo fans. This, in turn, skews the results a bit.
Retro Tech Select - My Youtube channel. Covers throwback consumer electronics with a focus on "vid'ya games."
Latest Video: Top 12: Best Games on the N64 - Special Features, Episode 7