Nothing much at all really.
I prefer "femme" and butch", since they float free of gender essentialism. Femme and butch are performance of gender; self-expression, of feelings, of style, of attitude. If I feel a greater need to cross-dress than usual I might "up my femme"; or maybe I'll feel the other way so that someone might say "you're looking very butch today".
Does that make sense to anyone else?
