i used to use a 20ga supersport for waterfowl. I sold it and bought a 20 cordoba. same exact gun as the supersport, just all black instead of a shiny receiver and faux carbon stock/forearm. by the way, it is my favorite waterfowling shotgun and the one I use 90% of the time. also, I added weight to the forearm and stock and it is aprox. 18 oz heavier than original.
My 12 ga. SS has accounted for the demise of many birds and I much prefer the fit and balance of it over a Cordoba, which was in the mix, at point of purchase plus, it also has been the one I shot the best at SC as well.