There are hundreds of threads debating whether your should be ordering a Porsche with pccb or not, or if you should convert to iron from pccb, or if you should consider upgrading to pccb if you have standard iron brake.
Some argument are more obvious like cost, durability, dusting, squeaking etc. but these are not the intention of this discussion, as they are all subject to one's opinion and that's why the debate is going to continue, and when it comes to that decision you may still be struggling whether you should "pccb" or not "pccb".
So today I am going to present a deciding factor that is objective and quantitative, with the analysis of Moment of Inertia between two brake rotor materials, to prove the advantage of a light weight rotor such as pccb which might be helpful to your decision when "that time" comes again.
Moment of inertia - Wikipedia
A quantity expressing a body's tendency to resist angular acceleration.
It is the sum of the products of the mass of each particle in the body with the square of its distance from the axis of rotation.