Xbox doesn’t have iplayer and 4od etc, as they are free and MS wanted to charge for them.
As others have said, very little between them, exclusives are the way forward, Gears of War or Killzone?? also mates, if they all have xbox’s then thats the way forward if not then PS3.
I tend to go through months where i just play the one console then swap to the other, my mates have both so i ended up with both consoles, I find the xbox pad better to use than the PS pad which is decades old now, sony haven’t changed the design since the PS1, i also find xbox gold is vastly superior to the PSN, i know you have to pay but its well worth it.
Also if your quick tesco’s currently have 20% off all xbox hardware and accessories in store and online, might be able to pick up a bargain, you can pick up an Arcade for just £87!!