JPS Labs Superconductor vs FMS Zero vs Emperical D

These are older but affordable used if you can find them. Has anyone compared any of these cables.....IC's or speaker. JPS would be the original superconductor and the + version. I use FMS Microwave and looking to upgrade these if its even worth it.
I use empirical design interconnects and power cords throughout my system and have for years. I've tried a number of different brands, including the JPS Superconductors, and prefer the ED's in my system. They simply get out of the way better than most cables, regardless of price.