This may be some combination of weird or opinionated, but it's just me.
I've seen different AR pattern shotguns. I never got one. I prefer the AR pattern for rifles. I've never really taken to AK. The AR to me seems like a precise instrument. Well the AK comes off more as a shovel.
But the simplicity and brute force operation of the AK are fantastically suited to shotguns. AK pattern is the way to go. The Chinese are making them now that take all Saiga mags, furniture, and accessories.
SOME people say that they're better than Saigas because Saigas had feeding problems and were very particular about ammo. I'm not going that far because I haven't done any real comparison, I've had hundreds of rounds through mine and haven't had a feeling problem, which is impressive for any new shotgun.
Mine is called Cheetah and I believe another one is called Lynx.