Hi Cathy.... Dark is better than light i think.... But if you ask me Cement Render is the best.... (You can wanna believe that i have no money since i am promoting cement render
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Actually if you use light shades of tile the thick layer of dust that will settle down is easily noticeable. In the long run causes discolouration of the tiles. Finally you will have to clean it twice a day. Not joking!! I still have this problem (Ofcourse not here at Setia Tropika)
Now if you use dark tiles the dust, dust marks are still visible.
Either way you gotta sweep and mop outside twice a day.