I'm sorry I'm not home and can't change it today at all really, but buying armour from xur gives you a weaker version. I bought don't touch me weeks ago, about a week after that I got one from a drop. I was about to scrap it when I noticed a green arrow, the discipline was higher! Currently my discipline is 104 on my don't touch me, and it's still got two defense nodes.
Has anyone else noticed this? I checked xur today because he was selling them again, and yep it's still higher.
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Naa it is random I got a skull of dire ahamkara from a nightfall once and that same week xur sold it and it was better, then like 3 weeks later he sold it again and it was even better.
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Random drops give random rolls. Hell, I got Ruin Wings from an engram and I think it might be inferior to what Xur sells. Anyone know the numbers there?