okay let's compare
2010
OCT 9th PS3: 237,892 360: 181,320
OCT 16th PS3: 243,828 360: 171,372
OCT 23rd PS3: 253,279 360: 176,618
OCT 30th PS3: 283,793 360: 213,045
NOV 6th PS3 313,465 360: 360,822 <--- Kinect Debut week
NOV 13th PS3 378,898 360: 520,893 <---Black Ops Debut week (huge 360 hardware boost)
NOV 20th PS3: 345,757 360: 453,942
NOV 27th PS3: 765,116 360: 885,353 <--- Gran Turismo 5 Debut week
DEC 4th PS3: 619,455 360: 665,244
DEC 11th PS3:696,487 360: 771,313
DEC 18th PS3: 897,211 360: 1,060,849
DEC 25th PS3: 931,958 360: 1,114,283
2011
now Nov 5th 2011 is basically already confirmed to be taken by ps3
Nov 12th will be dominated by 360 due to MW3 but im not sure if it will be as big of a difference between ps3 and 360 like when black ops released because 360 was already ahead by a little less than 50k the previous week due to 360 slim+ $500 MILL advertised Kinect launch
Nov 19th should still be taken by 360 riding the small MW3 wave
but im not sure about the other 6 weeks because 360 does not have a slim 360 this year, no price cut (YET but it's just about too late for 1 to make a difference now), no $500 mill launch of kinect like last year and no new big kinect games to do anything relevant for it this holiday season(aka kinect wont be as big as it was last year)
but i guess we will have to see what happens
EDIT: idk how to do those little charts and i also did not read through the whole thread so sorry ahead of time if somebody already compared holiday 2010 to 2011