I don't know if he has the best... but Winky Wright as we know is a southpaw and often gets his opponents tripping over his feet. They are always right where they are supposed to be on orthodox fighters. He commits to this and has unplanted and un-nerved many opponents with this. They can never circled away from his lefts without getting off balance or moving straight back which are both bad things for boxers to be doing...
tough one rjj is definetly up there,pure fluidity alot of guys dont get the cred they deserve for their footwork ricky hattons is really underrated