Best protection for the paint is a combination of paint protection film and ceramic coating. These two products compliment one another when it comes to protective benefits. The PPF will protect from rock chips, scratches and uv.
The ceramic coating (which is applied over the PPF, any remaining paint, trim, plastics, glass, wheels and even interiors) will add more UV protection, but also resistance against chemicals such as bird poo, sap, bug guts, body pH.
And the coating also creates a non-stick surface that helps the vehicle to stay cleaner longer and makes it easier to clean and maintain.