real McCoy vs real deal

real McCoy

noun
  • The genuine thing, neither a substitute nor an imitation. 

real deal

noun
  • An authentic bargain. 

  • A thing or person that is genuine, authentic, or worthy of serious regard. 

  • A beneficial result or favorable state-of-affairs. 

How often have the words real McCoy and real deal occurred in a corpus of books? (source: Google Ngram Viewer )