both are great
360 is cheaper and have great games but some of them are on pc (halo and gears of war) and some is only on 360, u can search for 360 exclusive games thread here in this site , it's awesome
online gaming = 50$ a year
ps3 is great and the 1st party exclusive are AWESOME, there is a thread for ps3 exclusive games too,,
online gaming = free
I say get a 360 so u can enjoy it more with ur friends