There's one very good reason that 9mm generally has a higher capacity than a .40: it takes a hell of a lot more bullets from a 9mm to stop someone. Since you want it for protection I'm going to assume you'd like 1 shot takedown. Unless you're extremely good with head shots, I'd suggest the .40 for your desired use. Yes, the ammo is a bit more expensive, but you'll only need 1 shot pretty much wherever you hit them.
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