The BW image seems stronger since it emphasizes the detail and texture of the subject and image giving more of an impact while simplifying the image-which always helps compositions without a distinct use of color. While there is little to suggest a story here, I would consider this a great portraiture piece and from this the subject himself seems interesting enough to carry it past this too thought the pose is a bit too conventional for me. The window’s stick that holds it open seems too distracting too. The color version does not contribute much more than a confusing color palette being neither warm/cool or having a viable color scheme. You did do a great job at capturing good shadow detail without killing the highlight detail much-though comparing the original to the post processing would be nice. And a short lighting set up would be nice however I would like to guess here:

[INDENT]Beauty dish camera left and just outside of the frame at 3 stops over ambient and you flagged to cut the light on the lower part of the subject? The nice edge lighting might be from the white wall or street lamp but I believe it is a one light setup and you made use of some dodging and burning on the arm but mostly on the face since this is less believable. Am I close?[/INDENT]