From a w/l point of view I have no preference as far as position goes. Sometimes the client will initiate a certain position, then there are those clients who like to do the entire range ...

My job is to satisfiy to the best of capibility, within the boundarys I set. Most of the time I am getting off because they are, which lucky for me I suppose.
If the client doesn't initiate, then I will find out, in which ever way seems right at the time.
If the client wants me to choose the position, because he want me to enjoy or orgasm, then usually I will choose doggie. I tell the client exactly how I like it and guide them, which usually brings me to climax. If they finish before me, then I finish myself off while they rest. Usually they like to watch up close, and encourage me to get there.
In my personal life its different, depending on the person, the mood, and how horny I am. It also depends if we are indulging in sensual lovemaking, passionate sex, or hot hard fucking. I don't have a preference really, I'm more about the experience as a whole. I have many other personal preferences in the bedroom that rate higher on the list than position.
If I am with someone I am invloved with, ultimately I like to end with missionary. Having the intimacy, eye contact, kissing, watching my lovers facial expressions, verbalising, and so on. I also makes it easier to climax at the same time as my partner. Alternating between missionary laying down & with my partner up on his knee's is the easiest way for me to achieve multiple orgasms and squirting. Finally, its also the best position if my lover is going to cum inside, as I am usually begging him to look at me at me while he climaxes. Then I can remain on my back to enjoy the exquisite feeling of his cum trickling out of my pussy. Sometimes I will orgasm one last time by masterbating using the warm silky juices, as I am starting to drift off.
Gee, that ended at bit hot and heavy, lol ... as usual.
Lauren x
PS Hope I didn't annoy you by getting off topic ;-)