According to the POR-15 folks it is UV-sensitive, which means the black will fade to a grey color over time when exposed to sunlight. I don't know what the silver POR will fade to, maybe white? As a matter of fact, exposure to sunlight will cause POR-15 to lose its rust-preventive properties and it will, in their words, "fail".
With all this taken into consideration I am convinced that the way to go is the epoxy/Chassis Black route.
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