Compare iBooks and Kindle apps, noting similarities and differences as you find them. Which do you prefer?

There two main difference between the iBooks and the Kindle apps that I noticed.  One difference is the folder system of the iBooks.  It gave a lot of freedom and flexibility of the program to arrange the books in various categories quickly and easily.  I could see a huge advantage for this in a school setting where a student at the very least would need to group all of their school books together separate from their private collection.  Also it could be used to separate the books by subject.  I assume that there is no practical limit as to how many categories you can have.   I looked and could find no coresponding function on the kindle. The Kindle just had books and papers which are the base of the iBook. If someone had large collection this would be very important.

The other big difference that I noted was the option in the Kindle of keeping the books on the device or in the cloud memory.  If the iBook had that featured it wasn't mentioned.  I could see that there could be instances where this also could be valuable.  There are still places where internet and or cellular services are very difficult and it would be convient to have some of the books loaded in the device, but not have to have all of your library there.  

Other differences that I saw just from watching the two videos were the choices that were present in the Kindle for page animation and differences that could be accessed in viewing the books.   On the whole though for a school setting I felt that the iBook with the folder system would be the better choice.  If I were choosing for my personal use it would be a more difficult choice and I would need some more investigation.