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The shotgun pistols like the Bond Derringer and Taurus judge are still handguns and therefore are primarily intended to be carried on person to provide immediate response to surprise attack. In order to keep size and weight down, limits on ammo size and capacity are incurred.

Home defense tools have different tasks and restrictions. More effective ammo (larger faster) is called for and a larger number of rounds is always better. In addition who may need to use the weapon affects the choice of tool.

A shotgun as the bump in the night grab gun is a stereotype because for longer than any of us have been it was the most effect bang for the buck. It balenced power and capacity and was affordable/available. If you friend likes the coach gun then he might be better served with one of the Stoeger sxs or baikal uo. If the household includes members that fight in lower weight class maybe a 20shotgun gauge is a better choice. I believe they cost about the same as one of the pistols. A step up to good economy pump like a rem 870 gives same effective ammo and hold more rounds.

I personally keep an ar15. It is as light/short as I could get with a light mounted on it and loaded with 55gr varmint round to minimize over penetration. Everyone from my youngest daughter can use it at need.

Whatever gun iis chosen, everyone in house should be able to use it and practice with it occasionally.