Personally I think the black Milanese would look much better due to the screen being black. However, they are known to scratch anything that touches them, screen and ceramic casing included. They are therefore the spawn of the devil, so stay clear! lol
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That being said, the grey ceramic is a funny creature and can change colour to suit its surroundings. In a bright room it can look almost titanium and in other surroundings, dark grey. All depends on the lighting due to the polish of the ceramic. For me personally, the pure steel looks a little jarring against the grey ceramic (example against the space grey, but it looks very similar on the grey ceramic) and is too much of a contrast due to the fact you have too many colours going on; grey casing, red crown (I have mine covered with a black dot instead), black screen AND silver lugs.
I currently rock the following with mine: -
An Amazon brown leather band with black hardware (to match the screen)
Apple Edition Grey Sports Band (the one it came with)
Nike Black/Grey Sports Loop
Apple Charcoal Leather Loop