That really depends on what kind of powerband and drivability you want, and what other mods you have. In general, the ProCharger Kit keeps pretty close to your factory torque curves, but just increases power and torque along it which means the truck drives really close to stock, but with more power. The ProCharger kit is also a good choice if you have an aftermarket intake manifold, since you could keep it, while the Whipple System would require you to remove it. The Whipple Kits give you a ton of power all across your rev range, which means you get a huge amount of power all the time without hesitation. While that's generally a good thing, it does mean drivability can be a little twitchy in some circumstances, but having much more power on tap usually makes the Whipple Kit a more popular choice.