PS3beats360 on 04 December 2009
VGChartz Hardware data for the period 30th Nov 2008 to 03rd Jan 2009:
Console PS3 X360
Total 2,190,818 3,247,596
Last year's sales numbers for December. This year the PS3 should easily outsell the 360 by a lot more than the 360 outsold the PS3.