PS3 all the way, I like the controller, it doesn't feel like a huge balloon, it's just the way it should be. I guess, for the mic part, I enjoy the fact that you can use the ps3-headset as a bluetooth headset for your phone, aswell. PS3 has, for a fact, better performance than the Xbox, but I guess that doesn't matter, since most of the games are made for both consoles, thereby not using the entire capabilities of the PS3.
About PSN vs Live, I seriously hate the way Microsoft makes you pay, just for playing online, and even more, the fact that they don't let PC-players and Xbox-players play together, I mean, they're on the same network, just that Microsoft blocked access to eachother.
But hey, I can choose not to use the Xbox, I'll just stay with my PS3.