My take on 40 cal.
I have had a couple. They seem more than capable for self defense. I also have 9mm and 45 ACP. This just seemed to add an extra caliber to stock with no significant superiority. I don't hate it. Just don't particularly care for it. Don't care much for a .308 either but lots of...
I am a big ol' boy so I dont have any problem concealing my 1911 in the cooler months. In the warmer months I carry a Kel-Tek PF9. So.... I guess my answer is both. Ammo is plentiful for either.