Exactly.
Personally, I think 12 gauge is better, cuz more physical shot pellets are sent down range.
Plus you do NOT need high powered double aught magnum rounds. They will tear you and the house apart.
Low recoil rounds, alternating between buck and #8 in the tube is a fine load for shooters of all ages and strengths.
The ever faithful 870, pump, tactical, 12 gauge is the go to firearm INSIDE our dwellings.
Why change between the the two?
(First shot to discourage him, make a lot of noise and pain?
Second shot (with buckshot) to put him down if nbr one doesn't work?)
If the SHTF, the 20-guage nut jobs will be sitting around with empty guns, thinking, “I should got a 12 gauge!” Burp!