Get both!

Seriously tho, here's the question I normally ask back to people asking me which is better to buy:
- What are the game genres you like best?
- Which console has more exclusives that you are thinking of playing?

And here are extra questions for you:
- Do you miss or have nostalgic thoughts of your old 360?
- Do you still have your old games, even just one?

If answer 3 or 4 is yes, then go for 360.

If not, Q1 and Q2 are research questions. Find which consoles have exclusives that you feel is more worthy to you or have more games in the genre you want, then go for it. Although they're tricky since most games are now multi-platform and available for both 360 and PS3 (hence the joke platform PS360). The only difference between them is that PS3 online multiplayer will not be able to see 360 players and vice-versa. So research carefully before you make your move.