I had the choice when I ordered my car, thought the black looked better.
Its a pain when the sun shines through the window and glints off the shiny black and the quattro badge into my eyes!
Use a lint free cloth (important) and foaming anti static cleaner, that wont scratch it or leave fluff behind. Throw away the cloth afterwards. All are available from maplins, cpc, RS, Buck and Hickman etc...