I think Bladedancer might win in a strict super v super scenario. From what I've seen, it takes 3 "ticks" of the Stormtrace lightning to kill a normal player. Players using Arc Blade usually have around double the health (it's damage resistance, but it's easier to explain with health), so it would theoretically take six lightning ticks before the Arc Blade player dies. The question is, how many slices does a Stormtrace user take before they die? Is it one, or two? The answer probably decides the victor.