I am 61 years old, and have fought both a 1911 and S&W revolver in real firefights, several times with each, successfully. The last revolver I carried for CCW was a S&W 3" model 66 (357mag) with night sights. I then carried a SIG 228 (9mm). I now vasilate between on of my 1911s (45) or one of my Highpowers (9mm).
My 21 year old daughter chose a Colt 45. Not a Kimber, not one of my Glocks, SIGS, Highpowers, Rugers, Springfields, Kahrs, S&W etc........ Shecould have had any of my many, many sidearms, but she chose that Colt 45.
She wanted a 1911 specifically a Colt 45. So I got her a Combat Elite, and proceeded to put thin grips, a flat Ed Brown Mainspring housing and a short trigger on it. She stands 4'11" weights 100 nothing pounds, and roars with that pistol.
I will not go into the EBR I gave her. All I can say is don't mess with Daddy's little girl, she does know how to use them. (her much older sister preferred the Glock 30.
As to why? Many folks have mentioned the excellent trigger most 1911's have or can be given.
The other major issue, is the 1911 can be made to fit almost anyones hand, PROPERLY. Short, medium, and long triggers, flat/arched mainsprings (some are flater than others), some are modified even more. Thin width grips, medium, and thick. Not a strip of rubber inspired by an inner tube that is no longer functional. Fit to the shooter.
No other gun has these qualities to the extent of a 1911.
Some of the newer guns are starting to offer a small number of modifications to help the shooter fit the gun to his hand.
SIG was the modern leader in this, with the ability to get a 'short' factory trigger for most models.
Now we have, the XD, M&P, SR9, SIGPRO etc...... but not Glock, allowing the shooter help fitting the gun to his/her hand. Not perfect but a very substantial improvement.
One of my criteria for a personally selected fighting handgun, is that it fit the shooters hand, not the shooter adjust to the gun. The 1911 offers that adaptability in spades.
Many of today's young and inexperienced shooters and fighters simply have no comparison or knowledge of this.
Sad but true. No one size fit's all. Even if it is a Glock.
Go figure.
Fred