Why it was expected? I thought X1 had some great bundles this month, why did the PS4 sold more? There wasn't any significant release for neither and XB1 had the price advantage, it was good enough for the holidays win last year.
The holidays last year Xbox One was $329 + 2 - 3 games + $50 gift cards. Insane deals. At $50 less the Xbox One is not as appealing as the PS4.