Tube Smokers work very well in just about any low oxygen atmosphere.
A pellet or gas grill has very little oxygen after the flame. This is where the Tube Smoker really works well. The Tubes have a larger mass of pellets than the AMNPS 5x8, and produce more smoke.
Tube Smokers also perform better at higher elevations. The AMNPS 5x8 seems to struggle around 5,000', but the Tube Smokers perform well.
Thanks Todd, I might have to try one of them out.