Wired Magazine gave the Paperwhite a 9/10:
http://www.wired.com/reviews/2012/09...le-paperwhite/
They also made a review for the Kobo Glo, but it's not as favorable (7/10):
http://www.wired.com/reviews/2012/11/kobo-glo/
Based solely on this information, I would go with the Paperwhite. (I know, two reviews is not a good singular basis of comparison.)