Free online gaming, yea? It's right, playing xbox online costs some money, but that's just like 20-30 ct a day... I think everyone has that. Also, Xbox has less money due to the reason it must be bought and it's useless buying months of free online gaming if you get banned inside of some days.
Also, I do not get what you mean about "Graphic differences", I've never seen any graphic different on Xbox or PS3 which was caused to the console.. You can change graphic settings of your console, you know? (well, at least at the xbox.)