Banner's unique charm lies in the ability to control emotions because of understanding himself.
At the beginning of the film, Banner followed the wrestlers to learn how to control emotions. Because of this calmness and self-control, he behaves more rationally. Even after the transformation, Betty's reassurance can dispel impulsive emotions and face himself again.
On the contrary, Bronsky broke the bottom line with the hatred in his heart because of the defeat. When the high ground of reason falls, the temple of benevolence and kindness collapses, waiting for him will be a path of no return.
Impulse is the devil, calm makes people wise.
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