The way I interpret the SIG Warranty, it isn't like or as customer centric as VORTEX.
From SIG:
Please note that our Infinite Guarantee excludes coverage for intentional damage, misuse, cosmetic damage that does not affect the performance of the optic, loss, theft, or unauthorized repair or modification. Excludes electronic and Tritium components.
Also from SIG:
Electric Component Limited 5-Year Warranty
From VORTEX:
VIP stands for a Very Important Promise to you, our customer. We will repair or replace your Vortex® product in the event it becomes damaged or defective—at no charge to you. If we cannot repair your product, we will replace it with a product in perfect working order of equal or better physical condition.
You see, it doesn't matter how it happened, whose fault it was or where you purchased it. If you ever have a problem, no matter the cause, we promise to take care of you. You can count on the VIP Warranty for all Vortex Optics riflescopes, prism scopes, red dots, rangefinders, binoculars, spotting scopes, tripods and monoculars.