It’s hard to beat a good shotgun for home defense in either 12 gauge or 20 gauge, and one of the best choices is the Mossberg 500 or 590 series. The 590 is basically a more durable version of the 500, intended for duty use.
You would specifically want to take a look at the Mossberg 590 Shockwave, which is much shorter with a chopped down barrel and a chopped off stock. The 590 Shockwave is surprisingly easy to shoot and is very nimble for a defensive situation. As a home defense weapon in these chaotic times, the 590 Shockwave is hard to beat.