I think the 300 hybrid's ramped up performance can be attributed to the fact that they are hybrids bred from probably campbell drakes from good lines, and females from other breeds with good laying lines and the animal husbandry phenomenon of "hybrid vitality" gives them an edge over the...
Layer bred ducks *on average* lay longer into the cold months than chickens. Layer ducks *on average* are effective layers longer in life than chickens in terms of years. Layer ducks *on average* are less prone to getting egg bound.
Ducks on the whole are more cold hardy than chickens, and...