I personally like the chrome bumpers. But I am old (55), so there ya have it. As the OP mentioned painted ones get a lot of chips in them from road grit. It just looks like a cheap way out to me. Now for the really horrifying news. The "chrome" bumpers that I made sure were on my Laramie, are plastic!
I went under there to undercoat the rear one to keep it from rusting, only to find out it was plastic! Just like our Durango they have a metal bar across that is the actual bumper, but the nice part that you see is plastic. My company truck, which is a Chevy, has chrome bumper ends that are plastic as well. They don't seem to pit as bad as the painted ones, so I will take it.
Oh & by the way OP, I would find it highly unlikely you can get the factory to put chrome ones on. You would have to buy them (probably stupid expensive even though they are plastic) & have the dealer install them.