Fairly safe to say that following these three rules will give the best chance of good results.

Rule 1: If you have specific desires, tell the papasan so he can either guide you or ask the girls on your behalf. Even better if you ask him before the line-up arrives.

Rule 2: The girl making -- and keeping -- eye contact with you is a positive sign. Not making it, or making it but then looking away, is a negative sign. It doesn't matter how good looking she is, if she doesn't "want you", your session likely won't be a good one unless you like boom-booming dead fish. When I say "want you", it can be for real or for commerce -- doesn't matter. But if she doesn't "want you", she'll be a dud.

Rule 3: If you don't like her looks or manner, it might be hard to maintain interest, or to finish, and so on. A lot of people put "looks" at #1 on the list, but I'm putting it at number 3. It's important, but not as important as the others.

Now, with all that in mind, I say forget the girl's category, and just ask the papa for what you want, and choose one you like the looks of from among those who make good eye contact with you. If price is an issue, throw out the "models".

Gherk

^^ What do you mean by "specific desires"?

Haha. What indeed.

But in all seriousness, if you want a girl who will DFK or will allow CIM, or who will speak French, or who is shaved, these are the things to ask papasan for.

And don't worry, he's heard it all before, and worse.

Gherk

While this is a generally correct rule, it is not always so.  There are many reasons a girl might not make or keep eye contact in a line-up.  Since I brought it up before, the models might not so this.  But they might give excelent service.  Or the girl might be very new and embarrased.  But she will be very appreciative in the room.

... gack, I tried to fit too much into a "rating" (to post #24). It should read:

We are in agreement. It's a matter of playing the odds. Reviews by other brothers are the best indicator, but even then, YMMV.