I guess I don’t know what you plan on doing with it, but 990 Adv seems less of an “all-rounder” than the 690 Duke.
Friend of mine had a 990 Adv but sold it and bought a Super Tenere. He liked it better for the 2-up off-pavement exploring he does with his wife. I think he said the 990 Adv was better suited as a high-speed tourer.
Now, 990 Super Enduro is something I’d be all over. Don’t think they ever brought the 990 to North America though? Oh well, used 950 SE would have to do.