It depends. Here's my opinion
PS3:
Pros: Blu-ray, free online, amazing upcoming exclusives, very reliable system.
Cons: Waiting for games to come out, no where near as much online extras as Xbox LIVE, nobody has a headset.
360:
Pros: Amazing online service, populated online service, good current games.
Cons: Hardware failure rate, paying for online, (my opinion) not as good future games.
If you need some games for either system, PM me.