Who is stronger Katniss? or Cato?

What makes Katniss so powerful? and so brave?
I believe that it is Katniss' fierce determination toward to stay alive and to resist the power of the Captiol. Firstly, Katniss must stay alive and win the game in order to go back to her home and familiy. She also promised Prim that she would come back to her. Moreover, Katniss detests the idea of the "Hunger Game" which makes Katniss and other tributes no more than game pieces. Katniss and Peeta want to show the Capitol that they are not the Capitol's entertainment by attemptting to commit suicide which makes no winner in the "Hunger Game". Having these determinations, Katniss is much more powerful, stronger and brever than Cato, who just wants to win the game and have fame and be rich.