I did not compare. The Duo was in my range, and Gregg recommended it. After reading Tom's review of it, I just pulled the trigger. The ability to dial in gamma and grayscale across each of the 11 steps, as well as the CMS feature, is worth its weight in gold.
The accurate color triangle took a little getting used too, and seemed drab. Now when I switch it off, everything looks like crap, because of the saturation. Football fields really look different.