It's not straightforward. Both Black Noir and Homelander have their unique skills and powers. It depends on the specific situation and context in the comic storyline.
Black Noir kills Homelander in the comics by catching him off guard and delivering a fatal blow that Homelander couldn't defend against. It's a thrilling and decisive moment.
Black Noir is black in the comics. The creators have designed the character in such a way to give a specific look and feel, and the black complexion is an integral part of that design.