I, too, love them completely differently. Ducks are always silly. Chickens are silly a lot of the time. Ducks are messier. Chickens are noisier than the breed of ducks I have (Cayuga). Duck eggs are wonderful for baking and I like them for eating, too, but my egg customers only want chicken eggs. Many breeds of duck lay seasonally. Chickens mostly lay year round, but slow down in the winter. (Some chickens stop laying in winter.)
Not all ducks need much water for swimming at all - a kiddie pool is sufficient, for splashing around in, not even deep enough for swimming.
Ducks are messy not only because of their liquid poop, but because they dabble in water, wash their food down in it, muck it up, and they drill holes in any muddy spots with their bills.
Ducks can bite harder than chickens can peck.
I don't care. I love my ducks and my chickens.