I expect the PSP to outsell the 360 "world wide" mainly due to japan, and OTHERS should be very close if not the PSP takes it.
Why? The 360 has been $199 for over a year, it either needs a price cut, or a huge ip/feature that causes everyone to buy it (NATAL).
Until then, I expect the 360 to be SEVERELY down from 2009 numbers, and neck on neck with PSP or below it.