In shotguns, the KISS principle is paramount.
My combat shotgun looks like this. It's a Remington 870. Today, it would have
Remington order # 24888
Wood stocks, 20" barrel, no mag extension, rifle sights. It's done everything I've wanted a police/military shotgun to do, for nearly the past 30 years. Maybe in another ten years or so I'll retire it when I hang up the rest of the duty gear. Until then, it's a trusted friend.
I've tried all the gee-gaws, including the pistol grip stock, the mag extensions, first one thing then another. I keep coming back to the basic shotgun. And, it wouldn't matter if it were Remington, Winchester, Mossberg, whatever. I've got other shotguns, but when I'm gearing up, this is the one that goes with me.