I'd hate to admit, but Superman is stronger than Goku, but Superman's extreme power is what makes the comics boring to read, since he's just beating everyone. DBZ is more entertaining because there are characters stronger than Goku, so it causes the viewer to keep thinking how Goku beats the enemy, which makes storywise better. Also, DBZ is also more entertaining actionwise because, well, it's DBZ. The real debate isn't whether Goku or Superman is stronger, it's whether which series is more entertaining.