I know it wasn't one of your options, but I say gold. If I had to pick from those two I'd say black.
lol i thought about gold too and i probably will go gold but i was just messing around with some spray paint i had stacked up in the garage, which was red blue green and purple. metallic stuff wasnt covering over too well though, specially due to those being fake metal rivets that are un removable. paiting spray paint with a paint brush is not the biz.