Lucci personality is a utter ass, the bare charisma he has come from his fashion sense and the threat and presence he had in Enies Lobby.
Enel had a cool power, haki before we knew what haki was, and he was somewhat entertaining.
Though my problem with Enel was that he was too strong way to strong for the arc villain at the time, even to this day Luffy defeating him is one the greatest bullshit of one piece.
Lucci on the other hand has quite possible the best final fight of a arc villain.
I would probably pick lucci because of the conclusion.