Generally speaking PS3 and Xbox360 are on the same league. X360 wins for easier to program, PS3 will a very tedious platform to produce game for, remember why Sega Saturn failed? So, to come up with the same scene or title, X360 need a shorter time which is very critical for game developer, shorter time means smaller risk. The first generation Cell processor is not very powerfull in fact the memory bandwidth could kill the speed the it gains. Wait for second generation is better lar. If you don't mind suffering mediocre games for the initial PS3 launch(cause the developers tends to utilisize only the 1 main CPU and ignore the rest), then go ahead.