2 great things came from 1911 :
Ronald Reagan and the 1911 Colt format pistol.
Both live on as legends !
The 1911 format pistol VS a SIG is a PC vs. MAC type arguement.
The 1911 is a proven, reliable format pistol. The constant is the design...not the quality between manufacturers. All MAY work and most need tweeking for absolute reliability. The consistant characteristics are they are single action, safe to carry cocked and locked (as designed), you MUST depress the grip safety gripping the pistol to fire and then press the safety down to fire.
The trigger pull is always the same and consistant...no double action and then single action like a SIG....nor a long cocking and striker fire like a Glock.
The clean, consistant trigger pull of the 1911 leads to consistant accuracy, based upon the shooting experience of the operator.
Nothing to decock to render safe to re-holster like a SIG. Just thumb the manual safety up and as it is holstered, removing your hand from the frame activates the grip safety from the frame.
The classic 1911 is a single stack pistol taking a 7 or 8 round magazine plus one in the chamber. As a single stack pistol, it is basically flat and conceals well with a quality holster.
Classically, it is chambered in 45acp...the bench-mark round for self-defense to which most other pistol rounds are compared. At it's classic 230 grain FMJ bullet, it is a proven stopper and less likely to over penetrate or bounce.
1911's are not all created equal, except in controls and function. You get what you pay for ! If you spend the same price point as a SIG $ 700-800, you get a pretty reliable pistol. Spend less..tolerate more issues..spend more..it's all about quality and features.
ANY semi-auto pistol should be fired a minimum of 200 to 500 rounds before being considered broken in and reliable for carry/self-defense. Lower end 1911's may need reliability tune ups for function with all types of ammo. Triggers may need to be cleaned up for a crisp and clean pull. On the original
GI style the addition of a beaver-tail grip safety and a round commander style hammer will eliminate hammer bite on your shooting hand from firing and
spread the recoil our better.
Best recommendation is have a friend let you shoot one...and see what you think. Recoil is manageable and custom features range from ambi safeties to better sights to suit your specific needs. The 1911 is a building platform that allows for many add-on creature features to suit your changing style or wants.
They are not for everybody and 45acp costs more than 9mm to shoot....but try one and see if this American classic peaks your interest !