Well ducks need a water source, more than just the small water bowl I have for my chickens. I could probably just get by with a kiddie pool, but I like the added benefit of the beautifulness of a cascading waterfall into a small pond with ducks chilling. As for every day care, I wouldn't say either are more or less work. If you have a pond already on your property they will go there and return to the coop at night if you train them right.