a good few vs quite a few

a good few

det

  • A number of, more than a bare few. 

quite a few

det

  • An indefinite and somewhat large number; more than a few; a fair number of. 

noun

  • An indefinite and somewhat large number. 

How often have the words a good few and quite a few occurred in a corpus of books? (source: Google Ngram Viewer )