[SRYnidan]

First of all as posed this is a lethal encounter (you are out numbered two to one in a disparity of force) so either could be used with lethal techniquies. The knife the prefered choice
1. Faster / more manuverable with multiple opponents.
2. Something I will have on me all the time (as mentioned)
3. Knive has more options available for stopping the fight without my having to commit my weight / balance to a specific attack line (i have more freedom of movement)
4. Better intimidation value.
5. If I was going to use flashlight as impact weapon I would want either my 4 or 6 cell "C" maglite ( better grip more concentrated impact.

Note: I am a Jujitsu instructor and have trained in both knife and stick.