heavy hitter vs king of the castle

heavy hitter

noun
  • A person of considerable importance who is a major decision maker or capable achiever; an especially significant organization or an especially functional object. 

  • A player with a favorable batting average who is especially good at hitting the ball deep into the outfield or farther. 

  • In any sport, a strong, physical player who is particularly effective. 

king of the castle

noun
  • An individual who assumes a position of greater importance, authority, or prominence than others. 

  • A children's game in which one player is located on something elevated and other players attempt to take his or her place. 

How often have the words heavy hitter and king of the castle occurred in a corpus of books? (source: Google Ngram Viewer )