I did some calculations for both xbox 360 and ps3 and i divided the end of the year potinital total sales to their life time sales.
Ill add 2million more to each xbox 360 and ps3s total sales for the end of nov 09, because thats how many more they could both sell this year.
xbox 360 is now at 31.46m,+2m=33.46
ps3 is at 23m+2m=25
Now ill divide each final number by each consoles life time,
xbox 360 33.46m divided by 4years =8.365m
ps3 25m divided by 3years =8.3m
As you can see both consoles sell identical, Infact the ps3 is selling a bit faster than 360 overall.
Note im not saying each console sold exactly 8.3m a year but this is just a way of looking at it.












