Author here: I did a quick experiment with my Greyhound, Bebop, to figure out the treat he prefers best using pair-wise comparison analyzed with the Bradley-Terry model. Same tech as Elo scores in chess, and several other places! Enjoy!
My dog told me to write that the set of treats is missing non bleached rawhide, other dehydrated meats (eg rabbit, goat, fish), animal parts (eg ears), and vegetables. Also, he volunteers.
This makes me wonder what the research is for whether certain types or breeds of dog prefer certain dog treats, and how individual dogs might develop a preference for one kind over another. Based on this experiment it doesn't seem like the type of meat matters much, since while the top ranked treat is chicken, his second favourite seems to be the duck one.