white devil on 30 October 2007
I think the chance is that they will perform close to each other. I definitely don't see a situation where either Halo 3 or SSBB will far outsell the other. That said, I think Halo 3 edges out. Software attach rates are higher on the 360, and Halo 3 is far more uncontested in being the "king" of the 360 than SSBB is on the Wii.
