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For me, the most important difference is that only KU allows you to read on an e-ink device. Selection is important and both Scribd and Oyster offer at least some Big 5 titles. At the moment, Amazon has more books available but fewer bestsellers. To me, that's not very important. I've found the selection in KU to be more than sufficient for my reading tastes.
In short, I've never been tempted by Scribd or Oyster because I don't like reading on a tablet but KU is a great program for me.
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