I'd choose a 20 gauge skeet gun - open chokes, shorter barrel - and load it with target loads.
A "long" gun is held with both hands which might make it harder to lose to an assailant, a shotgun is more intimidating than smaller guns like pistols when pointed at an intruder, light-loaded shot shells are much less apt to penetrate walls than a single projectile weapon, a target or hunting gun pressed into use as a defense weapon has more credibility than one that's obviously intended to be anti-personnel as its first purpose, at least in some jurisdictions.
All that's been said here about getting training and practice is on the mark, IMHO.
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