Neither
I know people swear by their 1911s, so don't shoot me if you're one of those, as I personally think the 1911 is a fine weapon, and the fact there are so many originals, replicas, and offshoots floating around bears testamony to the original design of the firearm!
Having dodged that bullet (I hope)...
The 1911 was designed via mil-spec through a process beginning in the 1890s, and enjoys
a fascinating history - in fact, it worked so well it remained largely unchanged throughout World Wars I and II! I've fired a friend's original model M1911, and was suitably impressed, even though he only let me fire a single magazine. That he did that much I'm thankful he was that good of a friend.
I've since fired several 1911's, including two of his models from the (I think 60s) and late-80s).
I find the following Wikipedia entry informative:
"Dissatisfaction with the stopping power of the 9mm Parabellum cartridge used in the Beretta M9has actually promoted re-adoption of handguns based on the .45 ACP cartridge such as the M1911 design, along with other handguns, among USSOCOM units in recent years, though the M9 remains predominant both within SOCOM and in the US military in general."
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Source
To be perfectly honest with you, I LIKE the 1911 design. Solid, decent handling, and packs a punch. But for carry, I prefer the 9mm. Part of SOC's and the Marine's decision to go with the .45 is that they're limited by international military-use convention to FMJ rounds. In that type of round, effective stopping power begins with the .45 caliber diameter.
However, we can use JHP rounds here at home, which have the same or better stopping power as a .45 ACP FMJ round. This, and the fact that you can carry 16+1 shots in most 9mm vs the 9+1 in most 1911s is why the FBI and the vast majority of civilian law enforcement agencies switched from 1911s to .38s, to 9mms.
The only reason the military maintains any hold to the 1911 is because as a Geneva-mandated FMJ round, it alone holds the punch that's required.
I think it's time for a change, but will address this in a separate thread.