When I first got my Sierra Denali, I bought a Predator. I liked what it did and I liked that I could "un-do" what it did, if I ever had to take the truck to the dealer. Prior to getting a Blackbear Tune, I even defended the Predator some in different threads on here. AFTER getting a Blackbear Tune, it was night and day difference..
I really liked my Predator until I was able to get a full Blackbear Tune on my truck. After that, I developed a good bit of disdain for the Predator and the empty promises of TCM support for the 6-speed transmissions in the half-ton trucks.
If the choice is Predator or Blackbear, don't even waste your time thinking about the Predator. The best money I sent on performance related mods for my truck was on the Blackbear Tune.