Automatic response for "Should I get a 360 or a PS3" threads:

Look at the games and services available exclusively on each console and compare that with your own personal tastes (or in the case of online, what you are or aren't willing to pay for).  Get whichever one looks like it will float your boat more.  

I think it's much wiser to think about it that way than it is to ask a bunch of random people (many of which are  complete fanboys for one side or the other) what you should do.

Each console has their own pros and cons, but in the end you can't go wrong either way, so get the one that appeals the most to your tastes.

Are you the type that likes playing games online with people or do you mostly like the story modes of games?  If you're more into the story/campaign mode then it doesn't matter so much what your friends have, but if you're into multiplayer stuff, find out what consoles your friends own and what games they play.