Firstly they're classes, not races. Secondly its a matter of opinion. Even if one is more over powered than another, one person could do really well.
Edit: If you say HunterExomasterrace its not. Exos may be a race but hunters are not. Exos, awoken, and humans is the most you can single it out.
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You know the "master race" phrase is a joke right? Rent a sense of humor will ya?