It doesn't matter if she's female or shemale, as long as shes actually cock riding and not sitting on a man waiting for him to thrust because that isn't cock riding. My list is below, I did 3 each.
Sammie Rhodes - When she did boy/girl porn, she would use her entire body weight on a guys cock by placing her feet on his legs.
Amy Brooke - She has an amazing ass bounce she literally jumps on and off a guys cock.
Asa Akira - One of the best grinds in the business, every time she rides it looks like she massaging a cock inside her.
Ladyboy Candy - Fastest and I mean the fastest cock rider, explosive energy and doesn't hesitate to put her legs where she wants in order to get better angles. If this girl were to ride someone who isn't a professional, she would probably break them in 5-8 mins.
Aria aka Bibi - She bounces her ass with her entire body weight, no matter what riding position shes in her entire body is always on top of the actor.
Jhenifer Eloisy - Best grind I have ever seen, she takes it from the hips up nice and slowly basically keeping the guy on edge of his orgasm, if you ever watched one of her videos keep an eye out on the cuts they make in the videos, usually because the guy is about to cum.