I choose flame red, which is not normal for me. I'm mainly a silver guy because I like the classy look with easy maintenance.
Red is quite bright and eye catching, but it's actually quite easy to maintain I've found. Just like silver, I can go a couple of months without washing it and it still looks relatively clean, especially from the side. Once you see the hood and roof front wise, it will be quite obvious how dirty it is, but otherwise you can get away without washing for a while and still look clean.
In terms of showing scratches, it's easier to see than silver or white, but not as much as other dark colors like greens and blues. Vastly superior to black in terms of maintenance, but then again just about all colors are.