The supreme court decision which becomes the "law of the land" is the
concurring opinion.
dissenting opinion.
majority opinion.
chief justice's opinion

The Supreme Court case that established the supreme court as the "law of the land" is Marbury vs. Madison.  It established Judicial Review as well as the supremacy of the court. But this is done through the Majority Opinion of the court, whether the Chief Justice agrees or not. 

Up the mula ya know: '(: '(: '(: '(: '(