Just like a lot of people, i also think the winner is determined by who pulls the trigger first, and unfortunately i don't know who that would be. Dimaria would be the obvious choice due to what happened cannonically, though it wasn't much of a fight at all. The bias inme would support Brandish, for reasons too obvious to explain
But the truth is, ultimately, i have no idea who would win. I always considered them equal.
Plus, i don't think they have any difference in terms of MP. I don't know where this thing about handcuffs comes from. Brandish reduced Dimaria's size so that she'd be easier to transport. It's not like she waited for her to be handcuffed, they didn't have to move before that. This is far from obvious that this situation proves Dimaria's MP > Brandish's, like, at all. This is far fetched.
But just my opinion anyway. I'm not going to vote and anyway, i have no idea who i could vote for in this match-up.