Well Momizi won and by a wide margin. I guess it shows that most of the fan base really is thinking on moe instead of vengeance. So I guess my speculation of upset via Vengence is out of the question.
Let's move on:
Round 48: Our masters are Out Right Now
Sakuya Izayoi vs. Koakuma
Sakuya Izayoi
Pros: Maid, Elegant personality, skilled knife user, maid, former hunter, shady past, loyal servant, polite even in the heat of battle, (former) Major Character
Cons: Some people think Sakuya may have warn down a bit over the years, other may think she need more of her history known, some see her as a vicious killer
Koakuma
Pros: Devil / Succubus, loyal servant, librarian helper, familiar,, Devil wings (which include head wings)
Cons: Other than the fact that she's a demon, most of her other qualities are mainly fanon, also Koakuma had no really canon development outside of EoSD
Advantage: Sakuya
Let's put it quick and simple: Sakuya mainly will prevail simply because she has more character development compared to koakuma who's development derives mainly from fanon material. That's what I see out of this literally. There's nothing else to explain here. Sakuya has so much character development that it be waste to discuss it here till she faces some serious competition. Simply put, her elegance and polite mannerism is what makes her moe and that alone over tops a devil's fanon moe based attributes.
So yeah, my vote is Sakuya and that's it.
Time to contine on Emi's route!