Doesn't really matter. They're all good to great.
I've seen Alexa, Alexis, Amber, Ashley, Jennifer, and Violet (as well as others that have since left HFH). Alexa is the only one I've not repeated with, and that's not to say the session wasn't good, but there's just too many other choices and not enough funds to go around.
Even the ladies I haven't seen are as well reviewed as the ones I have. Can't go wrong with any of them.
Just book ahead as some of their schedules fil up quick.