Re: Smokies: April or June?
Sorry to be late to your discussion. Answer: both.
I spent Easter weekend fishing the Smokies. The spring has been late this year, so the water is cold. The fishing has been slow, but ready to take off. The first 2 days I fished were tough. It was cold (30's and 40's). The next day (Saturday) it warmed to the 60's and the fish started snapping (mostly on nymphs).
First week of April was likely disappointing. Everyone expected the big days to arrive, but they didn't. The hatches were unpredictable; good afternoons, slow mornings.
June will be better. Fish will be biting in most of the waters. Enjoy the trip(s).