Musts for me: Short barrel. Short stock. On board light. Sling. Magazine tube all the way to the barrel so you have as many rounds as you can.
Negotiable: This brand vs that. Whatever. If it works I’ll run it. 20 vs 12 vs 410. Whatever. Shotguns are devastating either way. Bigger is better though. Buck vs slug vs bird. Bigger is always better. But at hallway distance it will just be one big wad of metal anyways. Buck might as well be a big slug at 10 feet.
Negotiable: This brand vs that. Whatever. If it works I’ll run it. 20 vs 12 vs 410. Whatever. Shotguns are devastating either way. Bigger is better though. Buck vs slug vs bird. Bigger is always better. But at hallway distance it will just be one big wad of metal anyways. Buck might as well be a big slug at 10 feet.