Metal and Plastic Bathroom Faucets are the Same?
The washerless faucets usually have a plastic disk with rubber seats and most are spring loaded but not all.
The last part is the pivot this is usually plastic also in both metal and plastic faucets.
The rubber is the part that fails and is the same in both plastic and metal framed faucets.
The seats are easy to replace and many are color coded for size.
I have not seen much difference with the exception of hard water deposits. With hard water the plastic frames break much easier than the metal.