Different Microsoft surface touch covers

I have Been trying to decide which colour of touch cover to get. I want the white one but I am concerned with the feel of material used. I noticed the black material looks different . I have done a research on this and I can't find anywhere it was mentioned . I even asked Tom warren on twitter and he completely ignored me.

Has anyone felt any other touch cover especially the white one part from the black cover and how does it feel compared to the black one.

Do you think the white touch cover would get dirty quickly?

Please Can anyone post a review or an image of the surface in portrait mode while reading.