This is an interesting query.
* Seri for sure: youth, service, and attention. She delivers on both the physical but also the emotional end. As juanjr650 put it, her attitude puts her at another level.
Total attention, and none of this mechanical rush you out the door at the end even with time left on the clock (I really dislike providers that rub your back as they can’t wait to get you out the door. I can think of several “popular” girls that do this even after multiple visits).