As already mentioned NWTF is big and loud. It falls about my anniversary weekend so me and the wife have made a weekend out of it the last two years. There is a whole lot to see and Nashville is a cool town. I have enjoyed watching some of the turkey call competitions and going to a few of the seminars. I don't really care, but you will constantly be walking by known outdoor celebrities if your in to that.
Unicoi is a small with many great custom call makers. I made a quick one day trip this year as the wife could not go and I had to work Saturday. I will definitely be going back to Unicoi and may take the wife just not as much to do.
Which one I go to from now on will basically be based on my time off cause I'm not burning vacation to go. I work shift work and the only day I could do either this year was Friday at Unicoi.