Phil,
My favorite food to smoke? Excellent question, though difficult to answer. Over the years I've smoked pretty much anything I could get my hands on, tofu to turkey, beets to buffalo and, being a bit fickle, I tend to love the one I'm with, or at least had last.
If I had to pick one thing I liked best from the smoker it would not be a particular type of food, but a bite, smoky fatty crispy bark hot from the smoker, be it from a pork shoulder, brisket, prime rib or rack of ribs.
Enjoy,
Gary