I have no experience with those two e-readers, but wanted to point out that the
Kindle Basic is $49 all week Nov. 23-28 at Staples in the U.S.
Also, can't you turn off the Glo's light (there's a light on/off button)? And because you say price is a factor whereby the Kindle Paperwhite 2 is too costly, you seemingly are buying a used Glo (it's $130 new from Kobo). So you might want to look at
this thread says that a newer Glo has warmer light levels, and also gives a hack for inverting the text and background (white text, black background).