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I have to say, I voted for Modern Warfare, because I'm a huge fan of Call of Duty 4: Modern Warfare, and Call of Duty: Modern Warfare 2, and I have high hopes for Call of Duty: Modern Warfare 3.
That being said, I have never played Battlefield 3, but another unrelated shooter titled Modern Combat: Domination is WAAAYYY better than the Call of Duty: Modern Warfare series. So, it is possible that Battlefield 3 (whatever that is) is also a better game.
So, if you're a fan of Battlefield 3, click here to vote and enter a chance to win the game you voted for!