Xbox360's come with headsets, thats an additional purchase for the ps3, controllers with vibration, thats an additional purchase for the ps3.
If you want a keyboard you can now buy that small bluetooth keyboard for the ps3, thats an accessory that adds clutter. You can't say that your console produces less clutter due to less accessories, when clutter is directly proportionate to how many accessories the user wants, and in the case of the 360 and Wii, they have alot of choice.
But thats all side babble, the key differences between the ps3 and the 360 are their games, 80% are on both so that doesn't matter too much, the ps3 has exclusives like Resident ev...no, um, Tekke... oh dear, its ok though they might still have Virtua.... nevermind.
Ace Comba... this isn't working, yes i'm a fan of Metal Gear Solid but i'm not buying a ps3 for one game, Killzone's shaping up to be a good first person shooter, like Perfect Dark Zero, which has been available on the 360 for years.
I'm not the head of a successful international company so i'm not even going to pretend i know what sony should be doing differently, i think its past it now, developers will keep making games for the 360 till Microsoft brings a new one out, and if sony are still playing the "ps3 has more lasting value" card when that happens, then Xbox won't only have the biggest most exclusive back catalog of games but it will also be more powerful than the PS3, then they can rule the galaxy in a tortoise shaped spaceship with a big golden smiley on it.