As they are, I prefer the colour version, it has more depth, although I find the shadow across the building distracting.
The shadow is less outstanding in the BW so I like that, but there is something a bit flat about the BW. I wonder if you play with the contrast and shadows if that would make it pop? I'd like to see the details of the building stand out more. If you can achieve that, I think the BW will be a better photo.