PS4 will obviously sell more first party, they always sell more. The only time nintendo sold more first party than Sony was last generation on Wii so it's factually untrue to say PS owners dont buy 1st party games.
Wii U could only beat X1 maybe, it depends of how many first party games MS will have this generation.
Predictions for end of 2014 HW sales:
PS4: 17m XB1: 10m WiiU: 10m Vita: 10m







