VGChartz' William D' Angelo:
"Xbox One Vs. PS3 Global:
Gap change in latest month: 59,753 – PS3
Gap change over last 12 months: 2,011,232 – PS3
Total Lead: 197,802 – PS3
Xbox One Total Sales: 19,430,872
PlayStation 3 Total Sales: 19,628,674
December 2015 is the 26th month of the Xbox One being on sale. The gap increased during the month when compared to the PlayStation 3’s 26th month on sale by 59,753 units in favor of the PlayStation 3. The PlayStation 3 currently leads by 197,802 units.
Both consoles launched in November. The PlayStation 3 launched in November 2006, while the Xbox One launched in November 2013. The Xbox One has sold 19.43 million units in its first 26 months, while the PlayStation 3 sold 19.63 million units."