Vizard will win, because they have both the power of shimigami, and hollows at the same time. Espada only transgress their hollow forms until they "release" their swords, which their true form is shown and all the hollow power is unfolded. The ability of being a espada i believe is the fact you don't have to eat other hollows to survive and not de-evolve back into their original form. My view on it so far.
