Although the company's seem to be similar, Adarand Company does not qualify for minority grouping due to their individual not being treated or considered lesser by their ethnicity. Due to them not being eligible, Pena and his company gain ruling of the court.
The department of Construction has thought out carefully and has decided to hire Gonzalez company due to their qualifications meeting the requirements. Adarand's company does not qualify enough, therefore will not be hired.
Side note : Gonzalez's company will end up benefiting the department more because they have a greater minority group than Adarand. Gonzalez' company will also be giving more compensation to the department which will greatly benefit them.