title_body: Kindle Paperwhite VS Kobo Glo: Screen Contrast Comparison
upvoted_answer: The Paperwhite uses a Carta e-ink screen with a contrast ratio of 15:1 however, here's a German test that says the contrast actually is 12:1 (assuming Google translate was accurate -- my German is horrible). It has comparisons with other models, too. 
  
  The Kobo Glo uses a Pearl screen with a contrast radio of 10:1
  
  Here is an older comparison of the two models that puts the Kindle Paperwhite's contrast ratio at 11.5:1
  
  Also, in terms of lending Kobos are compatible with library lending systems.