Fishing comforter set have a thicker wadding, about 250 grams to provide a more heated environment inside the bed without using blankets. As in the quilts, its filling cannot be remove since the whole quilt is sewn without having any space. By having a slit in the upper part of your fabric, you can put the best nordic filling you want. As we saw in another post you could fit the filling you want depending on its thickness (up to 500 grams) , for its material (feather, down, synthetic) or even for its color.
In short, if you look at the filling of the garment. The duvet covers give total freedom to put the type of filling we want, while quilts have a wadding of intermediate thickness. And fishing comforter set have a much thinner thickness. Both the quilts and the quilts fit perfectly in the lower corners, letting the sides and the lower part hang over the bed at a 90 degree angle.
The fishing comforter set covers do not have a point of reference to let it fit in the lower corners; and both its sides and its lower part gives the feeling of floating without being suspended at a right angle as it happens in a quilt or quilt.