None of them have any weapons, Deathstroke doesn't have his enhancements or his armor. The fight takes place in an average residential street, middle of the night, no pedestrians walking in the street and no cars on the road (there are cars parking at the sides of the road though). Deathstroke wins if he kills both Rorschach and The Punisher and vice versa.
So we have a very good fighter (Rorschach) and a great fighter (Punisher) teamed up against an amazing fighter (Deathstroke). Who... Is... DEADLIEST?!