Market research firm NPD has now recorded a full month of console sales for the PS4 and Xbox One in the US, and its revealing today that Microsoft’s latest console topped the sales charts for the month of December. Microsoft has long dominated with the Xbox 360 in the US, and it appears that healthy stocks of the Xbox One have helped the company take the edge during the all important holiday season. Microsoft’s Xbox One sold 908,000 units in December, alongside 643,000 sales of the Xbox 360. Both of Microsofts consoles topped the charts in the US for each generation.