actually on paper the 360 is a little more powerfull than the ps3.(don t beleave sony video there all CGfake remember how they lie about the "powerfull" emotion engine...the cell procs is the same bullshit)...games will look the same on both console.
and next gen game are so expenssive to make than most of the editor will bring games on both machine to make more money...
nintendo are the only one to bring something new and for a smaller price than the other...