I don't know, I suppose my opinion is an outlier here, but my favorite is the second (I'd be tempted to crop the top just enough to get rid of the light). The contrast and color are wonderful, and it also seems the most balanced to me. The first doesn't really grab me because it is not that well balanced - to me the wall in the lower left isn't as strong as the other elements. The third is good, but the wires in the upper right throw it off just a little.