i happen to have both so i can give you an accurate answer.
PS3's are probably the better choice, and for this there are several reasons:
on xbox you need to pay for live so you can play online
on ps3 online gaming is free and not full of american nerds that have lisps and tell you that you are a n00b.
also with internet, xbox requires your to buy the wireless adapter sperately, which costs nearly $100 AU (i think)
but ps3's wireless adapter is built in.
xbox controllers have battery packs, with which you must replace the batteries or an alternative is to buy rechargeable battery packs.
on ps3's the rechargeable battery pack is built in.
on the topic of the controllers, the actual layout of the controller doesnt matter, they are both equal. i cant see anything wrong with either of them. the only benifit that one has over the other is that the ps3 has a movement sensor built into it, but thats not a big deal because you hardly use it anyway.
the plus side of xbox is the large amount of games that it has, it depends on what you like they are all good on both consoles, but if your into online gameplay ps3 would be the better choice.
so yea, choose well...