I have used Branch Creek pellets and still do for some hard to find flavors.
For the same money, Trager is a quality pellet.
If you live or order from West of the Mississippi, the "base wood" is Alder and the mill is in OR or WA state. If you order from East of the Miss... the base wood in Oak and the mill is in Al.
I use mostly Trager pellets now and they seem to be "cleaner" and better burning. But, not enough time with them to be certain.
Either brand costs more than Fast Eddy pellets which are highly rated. But, with shipping Eddy's can get pricey. There is a group down here that buys by the pallet load and then Eddy's become very affordable.
For the amount of pellets a guy like me burns, the Trager or Epps pellets are not a financial burden at all. Whole lot cheaper than what I spent on wood processing and storage plus the charcoal.
There is a supplier in the MO area (or somewhere around there) who sells (produces?) pellets with a loyal following. She is Candy Sue and can be found on the CookShack forum a lot. Seems like quality stuff if you are in that area. I think they are BBQers Delight, but don't hold me to that
I think the older FEC and Trager controllers were "calibrated" for the BTUs/hour of a heat pellet like Oak. I understand that if you use a lower BTU/hour pellet like a fruit wood, the temp in the smoker will be lower.
Not so for the IQ4 controller--it just adjusts and holds the temp set.
That's about all I think I know about pellets for now
TIM