Ducks are consumed at a younger age than geese, so the feather and down isn't as mature. Duck feather and down will always be smaller than goose, as the birds are smaller themselves. geese tend to live longer, so the feather and down is more mature, and the oldest birds will produce the highest quality fillings. You can get a really good quality of down from ducks, however goose down is known to be the superior of the two, for its bigger loftier clusters. So the answer is, it comes down to your budget. Goose will always be softer, and feel more luxurious than duck.