If you tend to run at low heat settings than you probably want to stay with a pellet with a low ash level.
Here is some comparison information from my burning with Somerset being my standard barer, but realized I optimize my stove setting for the cleanest burn for each pellet, so if you just run your stove at the same settings your results will be different.
Keep in mind this is my stove using an infrared heat recording device, so these recordings can be used as a temperature differential gauge at best based on my stove’s ability to burn a given pellet, and my ability to optimize (tune) for the cleanest burn:
These readings are taken from a warm stove with the heat range set at #3 out of #5.
Somerset: 289*F, very little ash, fairly clean glass, little carbon build up, no clinkers.
Instant Heat: 237*F, bunch of ash, dirty glass, some carbon build up, on clinkers, did not like to burn at low settings.
Green Supreme: 261*F, double the ash of Somerset, fairly clean glass, little carbon build up, no clinkers.
Stove Chow: 265*F, over double the ash of Somerset, dirty glass, some carbon build up, no clinkers.
American Wood Fiber (AWF): 279*F, less than double the ash of Somerset, fairly clean glass, some carbon build up, no clinkers.
North American Pellet: 270*F, double the ash of Somerset, very clean glass, little carbon build up, no clinkers.
Maine Wood Pellet (MWP): 276*F, less than double the ash of Somerset, fairly clean glass, little carbon build up, no clinkers.
Triple D Dried Cherry Pits: I found that at a ratio of 10% CP to 90% Pellets the CP would add 5-10*F temp to the burn without needing to tune the flame. At higher ratios than this the temperature reduced dramatically because I didn’t tune the flame. A higher ratio of Cherry Pits also made loud popping sounds as the CP go through the auger, and when the agitator rod activates, so it wasn’t worth it to me to tune the flame for best results. No extra ash, or carbon build up was observed with the lower ratio.
All the above temperatures were measured on my GCI60/M55, but the Enviro Maxx stove recorded temperatures that were consistently lower by 5-8*F for anyone that is curious for comparison purposes.
I have yet to try any of the other pellets that are on my signature, for the weather has been too mild to waste the super-premium pellets (I just add some Cherry Pitts for some extra heat if needed).
*Note that I just picked up the Green Teams recently, so that is the reason that I haven’t tested the GT yet, not that I expect GT to perform in the super-premium pellet range.
I'd also agree and take the chow over the NA.
