Because Hulk is a very, very bad person. Sure he sometimes doesn't understand the consequences of his actions but Hulk "smashed" alot people and alot homes and he's caused alot of pain and misery and despair in his career.
Superman on the other hand has like one sin in his life.
Plus he has superspeed that would allow him to throw GR into the sun before Blaze even realizes what the heck happened.