DR-85 is the most popular double, but to me, when I think of double reeds that stand out or are different, I think of about three calls. I personally use the Power Calls Torque AA(LA style call), and have used the Grounds Hen Talk(another LA style). I like these because they can get really loud, but still keep that flat tone. Obviously they have good range for doubles too. Probably the most unique double reed, to me, is the Zink XR-2. It's a J frame style call, but has a really different tone and I've had good success with it in the past, especially on stale birds that have heard about everything.