Musically speaking and because I'm a big fan of rock and metal music, I really like HoD's OST (as far as I've heard it). The compositions are quite similar but fit to a (I think) exciting game.
But "Castlevanially"-speaking, the too-much hard rock sound doesn't fit to CV. Okay, the series had a lot of metal/rock tracks (The tragic Prince, Our Festival, CoD's boss tracks, etc.) but a whole OST wouldn't fit a conventional CV game.