Every time this comes up someone posts this video. Guess it is my turn.
I agree that your sights and called shots need to be the deciding factor, and that takes disciplined practice.
I learned the bottom of the triggerguard technique from a USPSA/IDPA GM during and Advanced Urban Rifle Class. Along with a variation of kneeling that I still teach today. I have not tried it on my current pistol, because I am currently running a G17, and or a M&P, and wear gloves enough of the year that drop safeties of those guns cause me pause and concern. It did work when I was running a 1911 with a 10-8 Flat Trigger....
pat