Got me. Years ago - I preferred metal guns because they decreased recoil. In fact, in 2005, I went with another Beretta Inox Vertec when comparing the Beretta to a Glock 34. The metal frame soaked up that recoil. Later, though, that Vertec proved to really and truly suck.
Now, though, all 6 of my guns are polymer guns. I have no metal ones. Over the years since 1993, I have gone thru many, many handguns. Probably 20-25 easily. The ones I like now all happen to be polymer, much to the chagrin of the local 1911 lovers here