I use both, but like posted above , for different reasons.
The only book I have on iBooks is the iPad 4.3 owners manual. The PDF reader is very nice.
I use Kindle for books because it syncs between my iPad and my phone easily. I like that I can pick up on my phone right where I left off on my iPad or vice versa
In either app I get the double page layout in landscape mode but with Kindle I can also choose a black background for night viewing
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Sent from my iPad