My feeling is that in a survival situation you'd be less concerned about taking big game (except maybe during very long term survival). Birds, squirrels, rabbits, etc. are probably more likely to be on the menu. And these would be hunted at short range. For that ... I'd actually prefer my air rifle (I'm not talking about a kids BB gun, I'm talking about modern adult airguns which are quite powerful).

More accurate than any of my other firearms, no recoil to speak of to make shooting difficult, doesn't need cleaning like a firearm, easily able to kill small game with a single shot, quiet (doesn't scare game away), and the pellets are very cheap and you can carry a good thousand of them in something the size of your wallet.

I might reconsider if this were going to be my ONLY gun. Might reconsider. Once you can get past the hit to any macho ego that may be in the way, airguns can be extremely practical.