My only adult experience with ducks (we had Mallards when I was a kid) is with runners, and I adore them! They are, as you said, incredibly cute, especially when they take off across the yard with that distinctive gait. And, I love the sound of their voices, even though I think the girls sound like they are laughing at me!
A 2-foot wire garden fence keeps mine confined. I had one -- once -- who could remain airborne for 4 or 5 seconds, but Claire was the only runner who ever showed any inclination toward flight. A fairly busy paved road goes past my property, and I don't have a problem with ducks trying to become road kill.
Initially, the breeder where I got them didn't sex the day-old ducklings, and I chose four -- of which three turned out to be drakes! Breeder is now pretty darned good at sexing babies, and all four of my most recent girls really turned out to be girls.
How friendly do you want your ducks to be? Mine recognize me as the giver of food and will crawl on top of me when I'm trying to fill a food dish. They will follow me across the yard when I yell, "duck, duck, house, house," a signal that dinner is about to be served. They will run up to me when I'm outdoors just in case food could be involved.
Quinn, the original female, will crawl into my lap to get to food (are you sensing a theme here?) and will gladly and awkwardly climb the steps to the back door checking for -- you guessed it -- food.
None of mine have ever liked to be picked up or held. But, if I sit still on the ground, they will climb on me, and nine of the current 10 will gladly eat from my hand.
Good luck on whatever breed you choose; I'm sure other breeds are just as wonderful, but I dare not find out because then I would want even more birds!