All 4 are all street smart, Erwin and Armin in particular are just far ahead of Levi. And I'm glad for it because Isayama has yet to make a character that can do everything as good as everyone else.Levi is street smart, Erwin and Armin are battle plan smart and Hange is a science nut. They all have the needed intelligence in certain scenarios to keep themselves and others alive. Though Hange sort of proved she really shouldn't be on the battlefield though. Her sense of self preservation isn't really too high on the scale.