There are a ton of advantages to each caliber. 9mm is relatively cheap and light in recoil. .22 is king of plinking. Many will say that .45ACP is the king of personal defense.
But, what if you were told you could only use on caliber for the rest of your life? What would you pick and why?
I am guessing I would go with 9mm, mostly because I am in love with my Sig P365.