[mandatory diclaimer] There is no magic sword. While everyone loves a good gun, the gun does not matter as much as you do. [whew, glad that's over--starting gun nut chatter]:
The arguments is favor of carrying the 1911 as your primary weapon are several in number and is more of a synthesis (sum of the parts) argument:
1. The stock is narrow and easy to control;
2. The single trigger makes it quicker to learn and the SA allows greater first round control;
3. The design of the weapon is thin, allowing it be carried easier than most larger pistols;
4. The design of the weapon allows easier manipulation, this is vital in one handed drills;
5. The magazines are narrow and "handier" helping reloads and making them easier to carry.
There are pros and cons of every weapon. There must be trade-offs. There is no black magic which allows the perfect weapon. There are valid arguments for the Glock, the SIG, the revolver, etc., et al, ad naseum.
I made my choice after reflection and skuling. However, I realize that the most important part of the weapon is who is wielding it.