Sort of an unfair comparison though
1911 - been around for 100+ years AND has dozens of manufacturers as it's not tied to any particular company (anymore, probably due to patent expiration)
Beretta 92 - not sure when it was developed, but used by the US Army since some time in the 80's, made by Beretta only.
So of course there will be way more 1911's around, just from sheer time (let's face it, a well made gun can easily last 100 years) and manufacturer.
Also the 1911 is awesome, the Beretta 92 is good but there is nothing awesome about it.