Miley has actually sold more than her, but even if Miley hadn't sold more albums "bigger" album sales doesn't mean she was the biggest star to come from Disney Channel. Miley still has more impact, got Disney a billion dollar franchise, billion dollar movie gross, Hannah Montana is probably more iconic than Hilary herself, higher net worth and I'm sure I could go on

Any answer other than Miley is pure delusion and dislike for Miley