To each his own. I'v seen as much bias for and against calibers on forums than I'd probably see at a KKK rally. I don't care what caliber another person shoots. I say pick what you like and shoot it. When I bought my first handgun six years ago I went against my brother-in-law's advice and bought a nine instead of a forty. I did it for purely economical reasons. I wanted to be able to shoot as accurately as possible which to me meant shooting frequently. I could not afford to do that with a .40 but I could with a 9MM. If money was no object I would shoot .40 or .45 ACP also. I now own seven handguns and the one I enjoy shooting the most is my only rimfire - a Buck Mark Camper.
I comprehend how a projectile can, “lose velocity", but don't understand how a projectile can, "loose velocity".