I've narrowed down the color to either Saphire Black or Space Grey.

I think Saphire Black looks nicer than Space Grey when it's clean, but it shows dirt way too easily.

Space Grey looks decent, but not as good as Saphire Black, but the advantage here of course is the less evident show of dirt.

Saphire Black looks good but unpractical.
Space Grey doesn't look as good but practical.

I'm completely at a cross road torn between these two choices. Saphire Black or Space Grey!! Which do you think I should have? Any pros and cons that you might have or experienced?