It all kinda depends on how the X1 behaves when it gets a major release; we haven't seen a (possible) big seller like TitanFall outside the Holiday season, but if it follows the pattern of the Wii U I'd say that Wii U will reach 10m first out of the two.
I'm on Twitter @DanneSandin!
Furthermore, I think VGChartz should add a "Like"-button.







