One comment I see a lot in various forums like Pellet Heads Forum is that you want as much efficiency as you can get. As with lump charcoal, this means burning as clean of a cook as you can with as little ash as possible. Different pellet mixes will produce differences in what you get in this area, and the cooker you’re using will dictate this to some degree as well.
Pellet grills preheat quickly, so you can start cooking almost immediately, and the pellets are available in a number of woods, for different smoke flavors. The smoke has a subtle wood-fired flavor with less of the acrid flavor that comes from standard wood or charcoal. For the maximum smoke flavor, it’s best to cook at a temperature lower than 250 degrees, while higher temperatures cook faster with less smoke.