While I agree with Luc that the medium finisher isn't ordinarily that useful (at least in the contexts of the NF duels), there are some players who can be quite clever about it (I was going to go into an example...but then it occured to me that I would be posting an easily spammable no skill kills move). Also, it's not like the other special moves are better. I would say that the medium finishers are the best because they're the hardest to sidestep and get a hit in.
Vestril was here!!!!!!!!!