dec 8th, 2012
614,353 xbox360 -25% YOY
576,565 ps3 -10% YOY
dec 10th 2011
822,524 360 +12% YOY
637,833 ps3 -4% YOY
dec 11th 2010
734,907 360 +66% YOY
667,327 ps3 + 9% YOY
dec 5th 2009
443,704 360
610,807 ps3
The 360 has been nothing short of volatile in its sales over this week, and it has tanked hard this year whereas the PS3 has a pretty reliable trend for the same week, very steady sales with a slight decline again this year.
If these trends continue, the PS3 actually stands a chance to surpass the 360 next year. Like I said though, 360 is volatile, wouldn't surprise me at all to see a weekly increase YOY for 2013 during this same period if no new consoles are released.