This is a classic image for showing the benefits of both colour and mono processing.
The mono image is full of character, vignetted slightly to draw the composition in, the pose is full of questions and the lighting, just so.
The colour image has much the same dynamic, but the warm right/cool left give the image a whole other dimension. The left (to us) in blues and the right in warm tones, frames the man interestingly and dramatically. I feel it also creates a better sense of place and time.
On repeated viewing, i do feel the mono image is more balanced, but I like the tension and contradicting, but complimenting hues.