The first Just-my-opinion B-stick post got more response than I expected. It is a topic many readers are passionate about.
"Well, Joe, if the Ruger 10/22 is one of your top-three "only one gun" choices, what are your other top-three picks?
The safest route would be for me to be vague and say "Any Mossberg or Remington pump-shotgun in 12 or 20 gauge", but "safe" does not make for an entertaining blog or for educational comments.
Before I reveal my choice, I want to discuss the criteria for making this kind of choice.
The firearm must be widely available. What good is a choice if it is sold only to Law Enforcement Agencies or cannot be found on the shelves of most retailers?
It must use readily available ammunition and that ammo must be inexpensive.
It must have the potential to be a functional tool in the hands of anybody larger than the size of an average 12-year-old. That eliminates most uber-magnums.
The manual-of-arms must be easily taught and friendly for shooters who are left-eye dominant.
The action must be proven and indifferent to lint and modest amounts of "dirt".
It must be a "General Purpose" firearm. That is, it must be able to execute a wide-range of tasks tolerably well rather than be perfect for one task but woefully unsuitable for nearly all others. An example of that kind of specialty firearm would be a 15 pound varmint rifle with a 26" barrel used solely to shoot prairie dogs. Not the kind of tool you would put in the back of your quad when you were going camping behind the pond or catfishing/bonfire beside the river.
Shotguns in general...
Shotguns in general are the default choice for the gardener who protects his garden against rabbits, woodchucks, raccoons, possum, squirrels and crows. It also has the "Oomph!" to protect it against larger varmints although legal entanglements are likely to result.
And then there is the defense of the hen-house where fox, coyotes, feral cats and dogs might be targets.
In much of the Eastern US, shotguns (and blackpowder) used to be the only firearms legal for harvesting Whitetail Deer. A bit of historical reference: "Trade-guns" used in the fur trade were typically smooth-bore, .57" flint-locks. The Native-Americans cheerfully used them to slay moose, elk and bison. A 0.57" round-ball weighs 280 grains while the round-ball for a .20 gauge weighs about 385 grains...a very substantial difference in favor of the "puny" 20 gauge.
It is overkill for chipmunks and rodents and smaller birds but it will definitely kill them.
Shotguns have a long history for home-defense. The only potential downside is limited ammo capacity.
In a shit-hits-the-fan scenario you are going to be ground-sluicing a lot more game than wing-shooting so I give that capability far less consideration than most people do. In my opinion, the entire wing-shooting ethic came about because ground-sluicing is TOO effective and is hard on game populations.
And the winner is...
The Mossberg 590 in "Fudd" rather than "Tact-i-cool" furniture.
Personally, I would pick the #50699 version in 20 gauge with the 8 + 1 ammo capacity, ghost-ring sights and synthetic stock. I would also pick up a case of Federal or Remington ammo loaded with #7.5 shot, the largest size shot commonly sold by-the-case.
12 gauge is also fine but skip the .410 offerings due to ammo availability issues and being less versatile out in the field.
The Remington 870 is not a bad choice. You can buy magazine extensions to increase ammo capacity but then it is not an off-the-shelf gun. The Remington 870 is also hampered by the safety which is not ambidextrous.
The Maverick 88 is an economy version of the Mossberg pump shotgun but it does not have the ambidextrous safety or the ability to upgrade magazine capacity. Frankly, the extra capacity is frosting on the cake. I rarely stuff more than two shells into my boom-stick when going forth to defend hearth, home and garden.
If you have some other shotgun, don't have a hissy-fit. It is probably a fine weapon. These kinds of blog posts are to give the gunny-guys something to squabble about and to supply a frame-of-reference for people who never thought about purchasing a firearm.
---Standard disclaimer: I receive no compensation or other considerations for any recommendations I make on this blog---