In my opinion, Zidane is a better character than both of them, but Squall is a better leader. Like Bolivar said:
"But Squall was a soldier, and nothing more because he didn't want to get his mind involved in different things. He didn't care about anyone's feelings, he only knew the mission and how to get the job done. This is the type of person you want commanding you if you were ever to go to war. So although he may not have been the best main character, he was a great leader."
Squall was very professional, and i liked this.