My favorite duck call depends on the situation I'm in. Large bodies of water I usually blow my Echo Championship. In close, I like the DR 85 as you mentioned as well as my Banfield's Best and Primos Original Wench. Double reeds represent more ducks, and in my opinion, are a tad easier to represent a true duck sound for inexperienced callers, whereas single reeds roll over into feed calls easier and sound more convincing for "good" callers.