A good shotgun out of the box for home defense is the Remington 870 Marine Magnum 12 gauge IMO. Simple,durable finish, easy to use , high capacity for a scattergun and fairly inexpensive. A little accessory called a side saddle ammo carrier makes it a fairly simple rig to keep handy with a few extra rounds.
There are better,more complex, worse, cheaper and more expensive out there but this was my choice for the 12 gauge that doesn't reside in the gun safe.......:o)
Stay Safe !!
Thanks. Do you have a handgun as well? What do you recommend?