I want to say Sam, but honestly? I'm going to put in a vote for Blade Wolf simply because he's the only A.I. out of the group and has access to things which the others don't. Well, what I mean is... As an A.I., he can determine the weakness of his opponent and capitalize on that.
Sam, Monsoon, Sundowner, and Mistral all have to rely on their instincts to determine what their opponent will do and what their weakness is. Blade Wolf can simply run an analysis of their body structure, study their movements, and adjust his evasive actions as necessary to avoid damage. Well, I'd be really surprised if Blade Wolf wasn't programmed with capabilities such as this anyway.