Us old farts are good for something I guess. lol
CC, the breed you should raise is what your market wants. I tried the "raising what I thought would sell" route. It was a bust. You need to research your market, find out what people are buying in YOUR area and what prices the market will bear, then figure your costs and see where you stand. Then you can find a breed that will make money.
I've raised thousands of chickens most years, several dozen breeds and varieties. Around here all that sells good are production reds and sex link hens. Definitely not my choice of birds to raise, but I can sell all I can hatch for a fair price. I also raise some rare and unusual breeds. I sell a few... not many, and sell a few hatching eggs through the mail. All these "good" breeds lose money every year. I raise them because I love them, but the cheap production birds pay the bills.
As for ducks? I hate the things - nasty coops, wasted water, loud hens, fly out every time you turn your back, they just tick me off. My better half loves ducks though, so we raise several kinds. And I'll admit, we sell all we can raise every year. We have Pekings, Cumberland blue runners, wild mallards, black east indies, silkie ducks, muscovies....
The plus side to ducks is that they generally eat less than chickens and forage better on free range. They never get sick. They lay as good as most chickens. Most will go broody if you don't want to use an incubator. They are better at avoiding predators. Housing can be as simple as a small wood box out by the pond.
I don't know that ducks would sell well for you, but they are in my mind more profitable than chickens overall.
Just my opinion, your mileage may vary.
