The Knotty Wood Plum did not fare well in the Mad Scientist pellet comparison. I suspect that was largely because the taste testers were not used to that specific taste. While apple and cherry are common fruitwoods used in BBQ, plum is not. After several cooks with these pellets, I suspect many of the tasters would be fine with them.
In the past, many of the Traeger pellets were labeled as "Natural Flavored Hardwood". The Hickory and Mesquite blends are still labeled that way. Presumably, this means that the pellets are not made from Hickory and Mesquite, but are made from base woods flavored with the "natural" essence of these woods. That is what the Mad Scientist addressed in his Oct. 28, 2021 video.
Most of the Traeger pellets are now labeled as "Natural Hardwood Blend". The Traeger Cherry Blend pellets might contain some cherry wood, not just cherry flavor. In the Jan 12, 2022 comparison between different pellet brands, the Traeger pellets were probably the Traeger Signature Blend. They are supposed to be a combination of hickory, maple and cherry. This is much different than the natural flavored blends covered in the earlier video. Traeger might be improving the quality of their pellets in response to competition.
I have tried several brands of pellets. I have used Traeger Cherry Blend and it did well in my cook of split chicken breasts. The only thing I do not particularly like about the Traeger pellets is that they are more easily broken than some other brands. I believe this can lead to more pellet dust. If you have one of the older Traeger grills with a less robust auger and motor, perhaps the more easily crushed pellets are an advantage. I do not think that is necessary with the heaver direct drive auger and motor.
I have not tried the Knotty Wood pellets, but would try them if I see them locally.