Butcher manages to kill Homelander through a carefully planned and executed strategy involving a combination of surprise attacks and exploiting Homelander's weaknesses.
Billy doesn't kill Homelander in the comics. The interactions between them are more nuanced and don't end with Billy being the one to cause Homelander's death.
Billy Butcher has a lot of ups and downs in the comics. He has to deal with personal demons and external threats, which leads to some unexpected developments.
In the comics, Billy Butcher doesn't possess powers. He relies on his combat skills, experience, and a never-back-down attitude to fight against those with supernatural abilities.