Best tactical shotgun, pump or semi auto?

[theotherwaldo]

Shortened Mossberg 500 set up for mini shells for in-house use.
Other weapons for outdoor situations, if possible.

 

[psyopspec]

I have a pre-Cerberus 870 Marine Magnum in the safe. It hasn't had a role since I lived in the country.

If I were in the market now, I'd be more inclined to check out a semi auto gun like a Benelli M4.