I also like the juxtaposition of the buildings in the foreground. I prefer the color version, but not because I particularly like these colors. But in the color version, there's a lot of detail that is lost in the b&w version. I think this detail makes the color version more interesting.

I like to see the buildings as in the top photo, mainly because of their contrasting color, and for the graffiti. However, I also like the moon on a darker sky. I would have created an "curves" adjustment layer in photoshop, made the photo darker as in the bottom one, and then created a gradient in the adjustment layer mask so that the darkening would apply only to the sky.