This is the best answer here.
But let's say for giggles we had the opportunity to choose.
I personally am going to mix things up here and throw out that a semi auto rifle chambered in .22 win mag would be extremely usefull. It is powerful enough to take down game for food and at the right ranges, it will certainly inflict big damage at the right spot to a person. It is quiet enough suppressed that it makes for a nice medium range (100-150 yard) sniper.
If that doesn't fit your taste, then for all intents and purposes, a piston driven AR cambered in .300 blackout is superb.
Don't like that? Well then, take along an anzio 20mm. who care about cost, ammo, and life? Just scare away everyone with a single shot
Suppress .22Lr is perfect grey man. Pistol or long gun.
.22mag is a good all around choice. I prefer the .17HMR but that is JMHO. The .17 is rough on small game.
.223 is an all purpose rd. in the AR or a decent bolt gun. We have annihilated a few Yotes with this round.
.308 is a heavy hitter capable of killing a car. Aluminum engine blocks in modern vehicles are no match for this round.
Again....use what you have and get stocked up with the supply's to run it.