Considering the 360 with the power brick is larger than the ps3 and the 360 runs hotter i think both will probably arrive at roughly the same time but it will have a bigger impact on the ps3 which is considered more of an AV devise than a console compared to the 360.
PSN ID: T_Gears
End of 2009 ltd sales:
Wii = 67-68m
X360 = 38-39m
PS3 = 34-35m
Prediction: The PS3 will surpass the 360 on weekly sales after it drops to $299 on all regular weeks (no big releases).







