Although I love them all except the dead duck, I always get a bit suspicious about the screamer. It just can seem a bit overdone sometimes. I appreciate the positive feedback, don't get me wrong, but I guess I'm just not sure if it is always sincere. My favorite is the talker, especially the dirty talker. I don't need a running commentary of the action, but I do like a few salty words and phrases thrown in now and then.
I have to go with homonger on this one. Screaming for any duration is far too theatrical, reminds me of putting on a show or hoping someone will get the hint that your leg has gone numb and hurry up already! More often than not it's a tactic....lol
I am a moaner (must be those years of catholic school) and part talker (when I am feeling particularly debacherous)
More importantly, and much more difficult to recreate for the cinema, is the shaking, writhing, squirming earthquake. A crowd favourite. How many have a truly deep orgasm?