What a great request, really works to light up the imagination. A very interesting list.
Is Beverly still on the active roster? I thought she quit. I like her a lot, although I'll admit I liked her better when she had long hair
In my opinion, and no offence meant, I got the impression Lily can't hold much and would falter early, so I wouldn't vote for her.
Rachael is a long-time favorite of mine, but we've seen her go through a lot of holding contests so I think it's time to give someone new a chance. Same might apply to Carissa and Autumn.
I haven't seen the Briella movies so I don't yet have any opinion of her yet, good or bad.
So, who would it be?
Cheyenne's catastrophic loss of control and huge pee torrent makes her an ideal candidate, and Constance's "little girl dying to pee" antics works great for me.
So I vote Cheyenne vs. Constance.
It would be interesting to see if people really go forward with your idea of donating money for the prize, without actually getting anything in return except for a more interesting movie (which they will have to buy separately). I would do it once, for the heck of it, just to see what happens. But I'm a curious type of guy.