Best american idol winner ever????

Well, in terms of most successful after the show, it would definetly be Kelly Clarkson or Carrie Underwood. They've both won Grammys, which is definetly a sign that they are great singers. Even though Chris Daughtry didn't win, he is way more popular than any other Idol right now. I didn't like him on the show, but now I love his music.