Nicole can win Dancing with The Stars, be the leader of the Pussycat Dolls, judge on NBC's The Sing Off and still can't have a Top 10 solo hit in the US. If the X Factor doesn't do it for her then nothing will.
Cheryl was such a fresh face on the judging panel. She was different and stood out in a good way. She was beautiful, had actual commentary, criticism, & praise for the contestants - she didn't make it about herself like Simon & L.A. did - and she wasn't a total knob like Paula was.
My little sister who is 14 and only knows about Cheryl because of my love for GA even texted me saying she liked Cheryl more than Nicole Shitzinger. That seems to be the majority of public opinion.