Spider-man is still vulnerable and human, where Superman is invincible and has never had to exploits his opponent's weakness also he fought three of his friends(The Lizard A.K.A Curt Conners,Venom,and the Green Goblin).
When has Superman had to do that?
Superman has invincible powers , etc. But Superman has to struggle with his only love. Lois Lane was the ace reporter at The Planet, until Clark Kent(Superman) came along and displayed a tough competition.