I have two fuel rails, and since I am going to do the top gasket on my ram, I figured I would want to put the better of the two on, I have a metal one (Which is currently installed) and a plastic one (which came from the donor truck)

 

The plastic one doesn't have the schrader valve for the fuel pressure check. So, I'd go with the metal one.

 

metal>plastic

 

metal.

 

Metal, most plastics don't dent.