From this list, it depends on what you mean. Big Ben and Freeman are loads and hardest to bring down, Rodgers is easily the fastest in a straight line, and Romo probably has the best jukes.
If I'm taking one just as a QB, it's obviously Rodgers. He is the best QB in the NFL right now, bar none.
This play was the sex though:
(sorry I don't know how to make it a video on the post)