Winchester 1300 Defender (pump, 12 gauge). Anything smaller is a waste of time, and this thing will fire reliably. 12 gauge ammo is plentiful. I keep #4 ammo at the ready for mine; about a 1 foot spread at 20 feet. Don’t use slugs/buckshot in a house unless you *want* to go through walls for some reason.
Revolver, blued (not chrome). Brand etc barely matters, just don’t buy cheap crap. Get at least a .357 if this is the extent of your gun buying and it’s only for the house/vehicle.
In either case, make sure it’s comfortable (fits your hand/shoulder/etc), and practice - a lot. Remember you’ll be using it in the dark, half asleep, probably in a panic. Needs to be second nature to load/chamber/unsafe/aim/bang.
If you’re the slightest bit uncomfortable, or entirely new to this, take a gun safety course. Apparently it helps, but I grew up with them and have never attended one.
Revolver, blued (not chrome). Brand etc barely matters, just don’t buy cheap crap. Get at least a .357 if this is the extent of your gun buying and it’s only for the house/vehicle.
Simple and effective. I like it!