Okay, with the release of Cadmium and Cerrobend, we have an (Almost.) complete understanding of how Allomancy works. Honestly, I think those two metals change things a lot. Channeling may be very, very useful, but the ability to slow down or speed up time? That would make any person's life that much easier. A Slider burning Cerrobend could do who knows what with all of that extra time. A Pulser, while not nearly as useful, could still make those dull moments trickle by faster. Either of those two metals would be enough to push me into a Mistborn.
As for a one-on-one fight, I think these metals would give an immense advantage, however I don't know if it would singularly be enough to push the fight one way or another. I think it would depend a lot on how much one could warp time, and how it interacted with other metals. Would a Pulser be able to see Electrum shadows more clearly, as the slowed time means less possibilities? Or would a Slider be able to see them more clearly, as once they left the bubble they would slow down? Would some of the shadows be easier to see as the shadows stopped burning metals?
Anyways, I think this topic deserves reconsideration now that we have almost all of the facts. (The only things left that I see are flaring, metal interactions, and savants, but those are mostly easy to guess.)