I like atributes of runners and cambels, butgot scovys as all around ducks easy to start with. they ate all the flies, mosquitoes, gnats, ants, roaches, snails,slugs, ticks, spiders, scorpions, snakes, and small rodents. Oddly they won't eat smalk young pigeons, songbirds, or small young banty chooks. they trim the grass and water with wet fertilizer that seems right down in so no piles to step in, and oddly not burning lawn or garden), eat the weeds(except one broad leafed one), haven't touched the garden for some reason. lay huge rich eggs, and my female started laying evety day, four days after got, for about twenty four days, then sat on eggs left, as i ate some. Hatched her first clutch out along with chicken eggs, defending from neighbor dogs, cats, and a least weasel. they took a week or two to fully tame to be able to pet, as year old adults never any anything before that. Most mallard duck breeds never become or stay tame as adults. they make hardly any sound except cooing grunting and hissing. they have head crests that they can raise and lower. they have claws to climb and defend selces with along with good hard nail at end of beak, but mine haven't used either on me, but backed off dogs before they could get at eggs/ducklings until my collie could get them. they are easily trained, herded, great memorys, and come when called.
now the cons.. they get under foot, beg for food and follow you around, can climb on fences and may perch on, may chase cats and dogs for fun. will be on your porch every morning waiting for you to feed cats. will be at back porch every night waiting for you to feed dogs. Anything that hits the ground food wise is gone no matter how small. they will be waiting for you when you get home. they don't sleep they nap and are up most of night foraging or waiting for bugs to fall from your porch light, or for you to come out or let them in. they may get into trash cans and bags. they may steal eggs when nesting.