rlavalle - great to hear that the rotors were installed correctly for the cooling.
It would be very hard to compare the longevity of the 2 different rotors if both of them were to run different compounds.
If you had ran the PF97's on the stockers, you'll probably get less life out of them compared to the 2-piece rotors under the same conditions.
What color did the two thermal indicators turn? Do you have a picture?