Best tunner to get 2001 chevy 5.3

I have a 2001 chevy z71 5.3 and i just wanted to hear whats the best tunner to get out there for mpg and power. ive checked out jet tunners but ive bad things from the past about them and granatelli performance tunners oh yah hypertech im just trying to find out the best one for my truck thats going to work good for it.