Many would have different opinions about who is the (that would be me of course) best duck hunter. Same goes for duck calls, single or double. What sound(s) are you after, how is your calling style? What will you be using it for...ringing hail call, working ducks, what? Give them some more info about your calling style and I bet more guys will reply. As for me, I have a variety of duck calls & whistles. And I'm always ready for anything, anytime, anywhere. Though, I don't prefer a double, never have, but that's just me. I'm not sure, but all the beginners/rookies I know blow doubles, I think it's a little easier to blow and doesn't require as much air or pressure. Every duck call I own are singles, that's all my pop owned and teached me with...guess that's why. My top three calls on my lanyard are as listed and numbered by my choices. 1)Buck Gardner acrylic tall timber 2) Sean Mann timber talker 3) RNT daisy cutter. Late season I like to toss in the Mallard drake buzz with my "talk." Well, in short and instead of rambling on and on, get a variety and keep them around your neck at all times and you should be alright. Never stop practicing.
As long as I got my waders on and in the marsh...who cares if I killed a duck today.