Fire: Iroh. He lacks the raw power and technical mastery of Jeong Jeong, but he incorporates other bending styles into his own, giving him far more versatility and, more importantly, far more control over his element.
Water: Amon. Guys, he can bloodbend without a full moon without even moving his hands. wtf.
Earth: Toph
Air: Tenzin had the greatest mastery over air. While Zaheer could beat him in a fight, I would chalk that up to being WAY more physically fit than an old vegetarian family man.
Fire: Iroh. He lacks the raw power and technical mastery of Jeong Jeong, but he incorporates other bending styles into his own, giving him far more versatility and, more importantly, far more control over his element.
Water: Amon. Guys, he can bloodbend without a full moon without even moving his hands. wtf.
Earth: Toph
Air: Tenzin had the greatest mastery over air. While Zaheer could beat him in a fight, I would chalk that up to being WAY more physically fit than an old vegetarian family man.