So far my SpyderEdge knives include:
Endura
Paramilitary
Tasman Salt
Ladybug Hawkbill
I use the serrated para for breaking down cardboard, blister packs, nylon zipties, etc. IMO, sometimes a PE blade does not give you a good clean incision and may require more force (like with some zipties). A SE will provide more points of contact with the material being removed, requiring less overall force. I work with fiber optic cable that is often coiled up and mounted on walls of data closets, when I do not have diagonal cutters handy, the SE si capable of removing the nylon ties with minimal effort and jittering of the fiber cable.