Haven't listened to Contraband in months, maybe even a year. Just put it on my work computer today (personal one died a while ago), and I'm going to have to give it the nod over Libertad.
While I think their second album had some great songs, there are also a few I can't listen to; namely "Spay." None of those on Contraband.
Furthermore, I agree that Libertad sounds like it has Scott's touch a little more, but because of that, I don't think either sound (the GnR boys' or Scott's) is fully realized. It's not as unified for me. Their third CD probably wouldn't have been interesting.
And by "interesting," I mean "still nothing close to STP"