bright spot vs upside

bright spot

noun
  • A good part of something that is otherwise fairly bad or unpleasant. 

  • Used other than figuratively or idiomatically: see bright, spot. 

upside

noun
  • A favourable aspect of something that also has an unfavourable aspect. 

  • An upward tendency, especially in a financial market etc. 

  • The highest or uppermost side or portion of something. 

prep
  • On the top of. 

How often have the words bright spot and upside occurred in a corpus of books? (source: Google Ngram Viewer )