Black Agent is more of an Oriental fragrance. Think along the lines of MIB by Bvlgari with a tinge more of a dry Green Vetiver & subtle Rose accord that is present for most of the drydown but, not a strong projector. Or Black is more of a Leather/Chypre (vintage bottle) that relives the late 70's & early 80's with their abundance of musk, castorium and almost tree bark like nuances. The newer version of Or Black is exceptional as well but, slightly goes a different path feeling almost like an Aromatic Fougere. Both are fantastic scents. Black Agent just has that dark oriental vibe and is more contemporary.