Fords? Holdens? Dogs? Cats? Today’s Android App choice is one of those either/or kinds of choices, with both Kindle and Kobo offering excellent book buying and reading apps for the Android platform.
Naturally, there’s nothing stopping you getting both; the apps themselves are free and both are well laid out with pleasant shopping interfaces and fuss-free reading. Kobo’s got a slightly better selection of Australian authors, while Amazon is often (but not always) slightly more competitive on price. Both rely on user accounts that should allow you to sync multiple books across multiple devices (even if you play on both the Android and iOS sides of the fence), so the only real lock-in is that you can’t (legally) shift books from Kobo to Kindle or back. [Kindle or Kobo]