I personally think the PF97s are better. Not because they stop you better than the Blues (they don't), or because they're cheaper (7k miles vs 30k miles!)...but because of how they feel.
Pagid Blues I found just did their thing, day in day out. You press, you stop. You press harder, you stop quicker. You press really hard, you stop very quick...and they'd do that time after time after time.
PF97s do all of the above...but with you only needing approx. 50% of the pedal pressure the Blues need for the same braking effect. That means that I can be more subtle with the controls, and also my heel/toe changes don't go to a bag of s*** beacause I'm putting my entire bodyweight through the pedal while trying to finesse a downshift like I have to on the Blues LOL.