I've shot a lot of guns over the 53 years I've hunted birds, but have settled on the Berreta A400.
I'd start there as an all around best choice, but if you don't mind the kick and getting your middle finger chewed up on heavy loads (Some guys do, and some guys don't), you might then try the SBEII, or any other inertia operated gun. If you don't need the 3 1/2" mags, you'll probably never have the problem with the middle finger getting hurt, but the kick will still be there in inertia guns.
Gas operated autos are the easiest on kick, by nearly all accounts, and most of these best new ones shoot the 3 1/2" ers no problem. Versa Max, SX3, Maxus. The Berreta A400 falls into that class.
I shoot a 26" barrel, and would never go back to a 28", and besides waterfowl, I shoot upland game, and sporting clays with it as well.
Pumps are good reliable guns, but step up a notch into the autoloader world, most guys who do, seldom look back.
There is no one best choice, but if you have the money, start looking at the best of 'em first. It will pay off in the long run.