The 6" device is a bit older and missing some of the features of the 5" device but it is bigger and that may make all the difference in trying to read PDF files in particular. I have both and my wife prefers the 6" device (EZ Reader Basic) for all her reading. It is her favorite while walking on a treadmill.
The 5" is 3" x 4" screen or 12 square inches while the 6" device is 4.8" x 3.6" or 17.28 square inches which is 44% larger.
Dale
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