I don't like any of these songs and I barely watched any of the videos but I'll say Demi since her winning a VMA might be awesome promo for X-Factor.
↑ It's all in your mind. Take your chances, turn around. ↓
Madonna | Britney Spears
Rebecca & Fiona | Grimes | Azealia Banks
Florence + The Machine | Lana Del Rey | Marina and the Diamonds
Santigold | Sky Ferreira | M.I.A. | Missy Elliott | Kelis | Taylor Swift | Wynter Gordon | Ke$ha