big picture vs grand scheme

big picture

noun

  • The totality of a situation. 

  • Used other than figuratively or idiomatically: see big, picture. 

grand scheme

noun

  • The totality of the situation approached objectively; the big picture. 

  • Used other than figuratively or idiomatically: see grand, scheme. 

How often have the words big picture and grand scheme occurred in a corpus of books? (source: Google Ngram Viewer )