Typical debate goes something like this: 9mm - with modern ammo it will get the job done .40s&w - capacity like a 9mm hits like a .45 .45 acp - the gold standard. I carry a .45 because they don't make a .46 I got all that. I have .45s, .40s, and 9 mm. The .45 will never go away. I learned on a .45 so I'm keeping it. So, using arguments other than which caliber is a better defensive round or which round is more of a he man round.... why should i send the 9 mm packing and keep the 40s or why should I keep the 9 and sell the .40? Main reason I'm asking is I want to simplify a little and focus on two calibers instead of 3.