For me touch shots are most satisfying. I sort of try to specialize in them as I don't play for money and like to surprise my opponents by disguising my shots. I purposely have a difficult swing to read and often change at the last moment. Wrongfooting is nice too. Sometimes I will just play an extreme crosscourt ball, with a very sharp angle that bounces before the serve line, close to the sideline. At other times I will pretend to do that but all of a sudden hit an inside out. It is quite satisfying to hit a medium pace winner, just because your opponent runs the other way. Dropshots and lobs, especially in combination are nice too. But if I can choose one shot I especially like it would have to be a cross-court drop volley almost paralel to the net.
"Most of us believe in trying to make other people happy only if they can be happy in ways which we approve." Robert S. Lynd