This is tough... For Chain, I think she's got the hunger and stomach capacity. She's some sort of werewolf (it's complicated), so I think she's like... ferocious? Big carnivore vibes?
But White feels like she's got the enthusiasm. She doesn't have much opportunity for good food, living in a hospital, so! She's got to enjoy it while she can.

tldr, the winner is me, for seeing those two fatasses eat at least five times their collective weights.