IMO opinion, if an intruder is hit at 20-40 feet either it will outright kill him.
I prefer the 12 as it may be somewhat heavier but that with helps felt recoil.
Someone might want to comment the recoil difference between a 12 ga with 2 3/4 loads vs a 20 with 3 inch loads. I'll bet they may be close and the heavier 12 ga might have an edge
montveil in the NC mountains
All persons present in uniform should render the military salute. Members of the armed forces and veterans who are present but not in uniform may render the military salute. All other persons present should face the flag and stand at attention with their right hand over the heart, or if applicable, remove their headdress with their right hand and hold it at the left shoulder, the hand being over the heart.