Thanos want to destroy half the universe while Ego plan is to conquer the universe
Ego wanted to expand himself throughout the universe just because he was bored. And because of his superiority complex; he believed he was the only being in the universe that mattered, so he was insensitive towards all other life-forms. Thanos believed he was doing the right thing in reducing the universe's population, but his means were brutal.
ego was trying to conquer the universe whilst thanos only want to kill half of it because he believed that it would save the people with no intention of conquering.
Ego wanted to conquer the entire universe just to show superiority whilst Thanos just wanted to kill half the universe for the sake of leaving a universe with peace.
He sacrificed his children for power while thanos Cried while sacrificing his most loved child
Ego's goal was to make the entire universe himself. Thanos' goal is population control by wiping out half of life in the universe.
they both are evil. They are both horrible fathers. But, Thanos' backstory actually made me cry and Ego's backstory made me scoff. Killing his baby mamas and his babies if they fail? ! Just so he can be powerful af? ! Thanos on the other hand just wants equality, He just doesn't want the same thing to happen as what happened on titan