i always like coloured photographs. however, the black and white always bring out the details and with the busy lines in this case, the eye is immediately directed to the silhouette. in the coloured version, the coloured tiles in the foreground distract from the silhouette. it is always nice to see the details in colour though. excellent shot and processing.
Mmmm....this one is tough. I like the way the structures pop in b&w, but I also liked the subtle tones that come through in the color version. Maybe a compromise by desaturating the color version a bit?