I'm gunna say b/w, just because the depth feels more realistic in it. That lighting is awesomesauce. One detail I see is on the left hand side there's just this line that looks accidental and kind of bugs me. The effects look great! Thought about adding text?
Well to quote you "I love it!". Very good tag mate. I like b/w because the depth seems better. (like carpediem said) v3 for me. The colored version is equally good though. Keep up the awesome work.