iBooks vs. Kindle – Which is better for a theological library?

IBooks
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I have been considering investing in digital books instead of physical books as I continue to build a library of books for ministry. The question that I have for you is: Apple’s iBooks or Amazon.com’s Kindle. Here is what I have so far:

Kindle – Pro

Kindle – Con

  • Black and White books
  • A Kindle has a single use.

iBooks – Pro

  • Color books
  • An iPad has multiple uses
  • Reader is available only limited devices
  • Integrated into a device that I already own (iPhone)
  • I am generally a fan of Apple

iBooks – Con

  • Smaller selection of books
  • Books seem to be outside of Apple’s core product strategy
What other pros and cons have I missed? Have you used these platforms? Which do you recommend?