Nylon Pro cables are the fastest and lightest. Due to their stiffer nature and nylon coating they keep their shape better during exercise and do not create a lag behind the handles. The stiffness and lag is represented in the image below.

PVC cables are the standard cables fitted to most ropes and are generally softer and slightly heavier. These are great for beginners learning jump rope skills as the speed is slightly reduced and handle feedback improved due to their weight