On the page and on-screen, its always been and will be Two-Face.
My favorite comic version of him is the Bronze Age take, with the green face and plaid suit. Because nothing says evil at the literal flip of a coin like gaudy plaid.
Favorite on-screen version is from the DCAU, as voiced by Richard “Bull, from TV’s Night Court” Moll.
SN: I don’t care what DC says, Deathstroke and Solomon Grundy are not members of Batman’s rogues gallery.
Deathstroke is however a member of the Titans’ rogues, while Grundy belongs to those who regularly rumble with the Justice Society.
Gotta go with Joker, so iconic, so scary, a true man with a plan (unlike the dark knight joker states). He truly is batmans greatest foe, in my opinion at least.
But the New 52, post Joker-relationship version. Such a greater character. And honestly, I don’t know if she’s really a Batman rogue much anymore, kind of neutral now.