Hmm..
360:
Faster
Better Graphics
Better draw distances
Less likely to crash
Better GPU
PS3:
Better CPU
Nobody gives a **** about blu-ray, so stfu
Better exclusives
Less likely to break when dropped..
Less likely to RROD(RROD can be avoid with good care)
I'd have to say 360, it's just a far better console performance wise, and graphics, yes, they are slightly better then the PS3's.