D.I.D. chain upgrade

Hey all I have a quick question for you all. I am in need of replacing my chain and sprockets and I have seen that D.I.D have both an upgrade and extreme upgrade chain and sprocket kit for the Fazer. My question is what are the differences? I cannot seem to find anything other than longevity.
Best Wishes

Here's the main data sheet link for the different chains(including tensile strength, weight, O-ring stlye, wear resistance, etc) :

D.I.D. Racing Chains & DirtStar® Rims


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