If you're already a wingshooter,
stick with a normal shotgun. You've got ingrained muscle memory that will be your saving grace when you've got fractions of a second to do what must be done. Your hands will know what to do when your brain is in reset.
Since "shooting flying" is an "instinctive" process, more akin to traditional archery than to any other shooting sport, shotguns are made differently than other firearms. A well stocked and properly-fitting shotgun will come up to the shoulder naturally, and should be pointed pretty much where you're looking without you having to do much of anything.
It's almost axiomatic that what is correct for any other firearm will be wrong for a shotgun. I find that even the skills don't carry over much. If I shoot my shotguns like my rifles, I miss. If I shoot my rifles like my shotguns, I also miss. There are some intermediate cases, like big-bore double rifles, but I'll never be able to afford one, so I've no idea how to shoot them well.
I don't even care for pistol-gripped stocks on shotguns. They point weird, and I can't shoot them worth a darn. My hands are telling me "rifle", the sight picture is telling me "shotgun", and the target tells me "you missed".
Shotguns are made like they are because, after 200 years of evolution, that's what works.
--Shannon