Waterline tile - light or dark?

[klnr629]

Pros/cons on white or slate waterline tile? We will be going with NPT Slate collection but I can't decide if we should go lighter or darker.
-Ash
-Pewter
-White
Would love to hear feedback if anyone has either of the tiles or similar. Coping will be Tundra Grey (stock pic attached but it is much lighter in real life).

 

[ajw22]

Welcome to TFP.

Light.

Dark will show the waterline scale and Efflorescence - Further Reading, as shown in the picture below...