The gap grew in favor of the PlayStation 4 and Xbox One in December 2016 for the second month in a row. The gap in the latest month grew by 246,923 units and has grown by 1.37 million units in the last 12 months. The PlayStation 4 and Xbox One lead by a combined 22.14 million units.
The PlayStation 3 and Xbox 360 in their first 38 months have sold a combined 59.60 million units, while the PlayStation 4 and Xbox One have sold a combined 81.75 million units.
[Source: vgchartz.com ]