I get pastured ducks from a farmer who raises them in tractors just like his chickens. I rub them in salt, paprika, garlic powder, and cayenne, and then roast them. Absolutely delicious. It's an occasional treat, though, 'cause they are expensive.
I do keep an eye on O6-O3 ratio, so I hear ya. I've honestly never considered duck's profile. I would assume that like with other animals, a pastured duck would be better than a grocery store duck. But that's just an assumption. I get them from the farmer to support him, and because the ducks are handled humanely (though I do wonder about them not having access to water -- maybe I should ask him about that).
I guess keeping my veg oil consumption low/zero makes enough room for the occasional duck in my diet.