Hi-
I haven't tested the AD-1 yet. I have tested Roadcrafters, Cousin Jeremy pants, Cargo Pants, and the armored Khakis and jeans from Aerostich. I guess the big difference here is price - $230 vs. $390 for the Aerostich. The Scorpions are overpants, not pants like the AD-1. No liner in the AD-1 that I know of - Scorpion has a liner. Differences in armor. A few other odds and ends. I don't think it's a direct comparison.
-MKL