Knife for sure. If it were knife vs. bat in a fight, the person with the bat only really has 1 swing to make something happen. If that swing isn't dead on, he is getting chopped up. Not to mention once the person with the knife is in close, the bat is essentially useless.
The 2014 Hit Squad (FFL)
Eddie Alvarez - Junior Dos Santos - Patricio Freire - Jessica Eye - Pat Curran