And what people too have to consider is that only the unattached hardware sales reveal nothing about the market leader. It is more a combination of the overall software sales, plus the profit a platform generates( xbox live, ps+ fees; digital sales; win loss ratio of Hardware ;software and so on) and the hardware sales of the platform combined which defines a market leader.
Take Apple and Samsung as example, Samsung actually sales way way more Smartphones than Apple when you just look at the unattached sales but Apple still make a lot more money with iphone than Samsung does, no one doubts that Apple is the market leader even if Samsung actually sells more phones.