Haha, we've had the same argument. If I was forced to use a knife, the only way to win would be to slowly get close, and then rush full speed inside the swing of the guy with the bat. Crowd him, then stick him. The problem is, you're going to get whacked badly at least once, and if it's your head or your knife arm, you're done.
Yeah in the end I chose the knife. The hope is you can fake out or absorb a blow from a bat and still be in good shape in the clinch.

