Well, I know this is replying a little late, and I know there's a bajillion other factors involved in effective ballistics; BUT:
If things are serious, and you don't have access to premium defensive loadings, and you need to use your range ammo in actual carry/defense... I'd personally lean towards .45 acp over 9x19 by a bit. And over anything smaller by a good bit.
Given our current climate, I would not condense the caliber options you have, particularly not among larger and more common rds. There's a lot of 1911 owners, and by extension a lot of .45 acp around. Not as much as 9mm Luger, but plenty out there, should the need arise.
In contrast, 9x18 and 7.62 Tokarev are effective too, but odds are slim that you can get an emergency reload from someone else.