For right now, I dont believe any of it. I hear this MS NPD report saying XBox beat cube in every aspect. Then I hear a NPD report for all systems, saying XBox and GC tied, yet GC software sales rose a lot, and XBox software lowered a little.
Its too confusing, so Im just not going to give either a chance. NPD only gets 60% of sales anyway. The other 40 is their best estimate. So really, Its their opinion that XBox did like it did, or that cube rose 150% in software sales over october.
XBox:
http://xbox.ign.com/articles/380/380934p1.html
Gamecube:
http://cube.ign.com/articles/380/380790p1.html