All of my information is taken from VGChartz, which compiles numbers taken straight from developers.
Xbox 360 Release Date: November 22, 2005
PS3 Release Date: November 11, 2006
Xbox 360 Total Sales: 35.11m
PS3 Total Sales: 29.01m
Xbox 360 Average Sales Per Year: 8.77m
PS3 Average Sales Per Year: 9.67
Basically what this says, is that the PS3 is actually outselling the 360 by a Million a year, and the only reason that the 360 is in the lead is because it was released a year earlier. Really, the only thing the 360 outsells the PS3 is in games.