Which straightener works the best? Kiyoseki, or GHD?

I know the Chi doesn't work that well because it breaks a lot, but no one seems to know if the GHD or Kiyoseki styler works better... Please Help... I have fried hair, and it drives me nuts! Oh, and anyone know of any good hair protectant that WON'T make my hair sticky and stiff? My hair is kind of thin... Thank you for all your answers!