cup of coffee vs cup of joe

cup of coffee

noun
  • One’s personal preference. 

  • Used other than figuratively or idiomatically: see cup, coffee. 

  • The situation where a minor league player comes up to the major league team for a short period of time. 

cup of joe

noun
  • One’s personal preference. 

  • A cup of coffee. 

How often have the words cup of coffee and cup of joe occurred in a corpus of books? (source: Google Ngram Viewer )