Los Angeles
An appropriate metaphor for me, would be shoes. Super stylish high profile providers are like a stunning pair of shiny leather boots you save for rare and special occasions. Takes alot to get them all polished up and sometimes, they can be difficult to put on, but are so damned good when they do. But you just can't wear em every day.
My ATF is that really comfortable easy to wear pair of sneakers you enjoy too much to ever let go of.
Silly metaphors, i know. But it works for me.
I have several ATFs. It is very hard to just choose one lady. I have a Blonde ATF, a Redhead ATF and a Traveling ATF. Not to mention a UTR ATF.
The first one has been the most erotic lady I have ever been with! We have a great session all the time and she knows my likes and dislikes. She has taken the time to cultivate a friendship with me. We laugh at silly things together and our time always seems to fly by. She knows the wine I like and has never been in a "mood" when we have been together. In a nutshell she makes my heart and soul smile!
Whenever I need a reference she is always quick to respond to the other provider for me.
One of the best things about her is she introduces me to her friends 
The Second is an amazing Gymnast ( taking advantage of the amnesty)
The Third a Gorgeous French lady I see when she comes to town.
The Fourth Well I can't talk about her here because she is a UTR and I'm keeping her a secret! She doesn't even know about TER.
The fifth one............We'll we will just see who I meet next week.
Honorable mention to my favorite Slovakian.
Bottom line is, there are so many wonderful ladies on this and the Las Vegas Board (LL) that I just can't see myself picking one the all have specific things about them that I like!