i used to use pf exclusively and then settled in on 97's for a few years. while i did that, my peers were swearing by hawk blacks. then i tried them and agreed with them. but i don't know blue. i'm guessing black is a step up from blue, and 97's as well, which is why they were feeling/working better.
my guess is hawk blue = pf 97
black is a step above both
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