ive burned...
lignetics, green and orange , love both all around best pellets ive used
pennington's natures own, burned well but had a slightly lower than average heat output for me
hardwood heat (TSC store brand) loved em!
clean energy(lowes store brand) was happy with them
corinth they were ok but not fantastic
barefoot burned well decent heat
marthwood wonderful pellet wish i could get more one of the best performing pellets ive burned right up there with lignetics
energex was happy with them
propellets, got those from eric at Kinsman stoves , would recommend them in a heartbeat as well , put them near the top of my list , might have been higher but i only brought a single bag back from ohio left the rest with my sister. as always , thanks to eric for taking the time to run to his other store and sell and load a ton for me on the fly!
im sure there are a few more but the names escape me. ive never run into a pellet which was "terrible" but each of the brands ive burned have all had certain charactoristics which some may like and others may not. as for heat lignetics shade the marthwood by just a touch but i'd be happy as a clam to burn either at any time. at the other end , the coninth pellets and the penningtons were probably my least favorites though they were in my opinion acceptable pellets in the case of the penningtons they did burn cleaner than the others but for whatever reason the stove physically didnt get as hot , same with the corinths but they were one of the dirtier ones i'd burned.
one thing ive learned in my work, one mans trash is another mans treasure. i migt take a call and have a customer say "brand x burns great in my stove ,and brand y is junk" the next guy would say brand y was good and he didnt like brand x.