If I had to chose, I'd opt for the .22. Simply put, more FPS and more projectile mass. Even for survival, the idea of having to either carry around a bunch of CO2 cartidges or giving 15 good pumps on a nice air rifle per shot would get old fast, and outweigh the pro's of ammo reusability. I'd rather carry a stinkload of .22lr rounds and not have to worry about single-loading a high-powered air rifle, because I assume your friend isn't talking about a Daisy repeater.
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