Well, that´s not true in terms of consoles.Xbox and Xbox360 both were really good consoles, and the new one seems to be pretty good, too(Too much emphasis on movement sensors and the like, I kind of prefer my good old gamepad, but still good).
I dont think the PS4 will differ much.In the end the biggest differences between the two will be, as always, their OS, Online-system(PSN Network and Xbox live)and the exclusive games on each console.