From a theoretical point of view :smartass: , I would guess that the best rope protector would be one that presents the least friction to the rope. The protector does not just protect the rope from being cut into at a single point by a sharp edge, but prevents the rope rubbing on the edge as the section above the edge stretches and relaxes, particularly when someone is climbing the rope. So, from this aspect, a PVC protector might be best.
However, in practice, I'm not sure if the material used makes much difference. :confused:
(Obviously, if a deviation or rebelay can be arranged, that's a much better solution.)
Dave (ducking and preparing to be shot down in flames)