I have finished reading my first book and have downloaded 2 textbooks in the Kindle app. I have read 4-5 books now in the iBooks.
I must say I like the iBook better. iBook looks more like a book. I like that it has the page numbers at the bottom and the number of pages left in the chapter. Even the way the pages turn for me was a better experience.
The Kindle was fine, but there were a few irritating things. I don't understand the location function at the bottom. It makes no sense to me. The table of contents do not have page numbers, so when I am planning my textbook reading, I have no idea how long it will take. Highlighting is a real pain, I keep turning the page instead of getting what I want highlighted.
I think the readability for both apps was the similar. I just find I like the way iBooks feels, hard to explain why, it just feels better. The Kindle definitely has a larger selection of books, but it has had a head start. The PDF function in iBooks is nice, puts everything I need in one place.
I think I will stay primarily with iBooks, and will only use the Kindle when I can't get the books from the iBook store.
I am just curious what others think?