I think that you underestimate Nightblood's power and Vasher's cleverness. We have no examples of non-Awakeners being repulsed by Nightblood.
We have no examples of non-awakeners being attracted by Nightblood either, if we use awakener to mean someone who can awaken given enough Breath.
With Zas' criteria, I have to vote for TLR. There's no mist for Vin to use (doesn't matter, as her earring is standard equipment for her), so she loses, and nobody can kill TLR without the power of a god to rip his age spikes out.
Vin doesn't need the mists for that, she can just use Duralumin. Remember, it's a question of sheer power being able to pull things out of the body. TLR tore Vin's earring out without drawing on the Mists, so a Duralumin fueled tug should be able to take out his bracers.
@Wilson, we haven't seen Edo in action. Without seeing it in action we have no basis by which to judge its effectiveness. We'll just go back and forth over whose speculation is most or least unfounded. Going by what has been shown so far however, Vin wins.
@Plas, I'm not sure Mental Speed works that way. And if a Feruchemist did pull a stunt like that and their opponent doesn't go down, they're SOL.