It depends on how you play, If you wanna have that quick lobby jump in that makes u feel like rambo but u couldn't care who ur team is and only last like 15 minutes a game then ur want mw3

If u want a good solid team and play as a team where one person going all rambo ends up at the bottom of the leaderboards (usually) and the game to have a huge map where u dont just run around shooting u can play jets and transport helicopters to move troops n tanks then ur prob want battlefield.

I'm gonna have to get both cause my gf wants mw3 and i will get battlefield I like working with a team to destroy others but yeah

Personally get MW3. You will get addicted to it and you will most likely enjoy it.

But I'm getting both games because I like them both!

Well depending on which game you're looking for.

MW3: is a fast past game with not the best graphics but... It's a game for Shooters to achieve rank on.

BF3: Is a great quality game where the real war stuff happens e.g shooting a tube into a wall. ( The wall will blow apart )

Like i said '' It depends what you're looking for ''

My vote is BF3 because the game has great graphics. Closer to reality. And because every other cod game has the same features... You just don't get anything out of it.