Modern glass cranking rods are true marvels and common knowdledge applied to glass rods apply only to old glass rods, no longer they apply to modern glass rods. Old glass crank rods were heavy, noodly, thick walled with virtually no sensitivity, modern glass rods are light years away from them.
The same thing is true with graphite rods, graphite rods used to be light, brittle, too stiff and too sensitive when compared to glass rods of the same era, not exactly the best for cranking, but such no longer apply to modern day graphite crankbait rods.
So nowdays it 's more a matter of what you prefer.
I crank with graphite. Why ? cuz I like graphite, but wouldn 't mind cranking with glass as long as it 's not one of them old glass rods I used to have.