When it comes to dry fly hackle, there is nothing better than Whiting Farms hackles, period.
Because of how Whiting gades their pelts and capes, it doesn't matter the grade, the individual feathers are all the same high quality. Whiting grades their pelts and capes based off of the amount of flies it can tie, which is typically several hundred flies (sometimes more), even on their lowest grade (Pro Grade).
Each individual feather is uniform in size, they all have high barb density and each feather is capable of tying several flies (sometimes a dozen or more depending on the pattern and size of fly). The color spectrums of the feathers are vast and beautiful, particularly the naturals, which are phenomenal! Which is also one reason why there are a lot of "hackle junkies" and collectors, myself included...