Both of these girls were axed from their respected shows. Both of them were always criticized by the media and the viewers. Both of them were gifted as singers. Both of them were mentors/judge but the question is, who's more effective, Kara DioGuardi from American Idol or Nicole Scherzinger from X-Factor?

Nicole maybe.. But i prefer Kelly.

Nicole>>>

Kara was never a mentor though. I actually think she would have suited better as that.

Nicole resigned. She wasn't fired.