Hi, this is for Maks_2000 who emailed me without a return email I can use. It is pretty hard to describe differences in whites, but what I would say is that the cotton white looks snowy, and the colonial white looks a little more flat and slightly dull in color. They are visually different but I doubt you will notice the difference after a few months. Given your marble in the bath, I would actually think the colonial would go better. The cotton might seem too modern. Hope this helps!