There is no difference in contents.
Which format you purchase depends on which device you will be using to read the eBooks.
Epub is the format commonly used for any eBook-reader other than Kindle, which has it's own format. PDF is best if you want to read it on a tablet / iPad or your pc / notebook.
“Talent without discipline is like an octopus on roller skates. There's plenty of movement, but you never know if it's going to be forward, backwards, or sideways.” - H. Jackson Brown Jr.
Hi! Sorry to bother you, I just have a couple questions I couldn't find the answers to.
1. Is the third ebook of Ten published and available for purchase yet?
2. Is Kae a two book comic or is there another book like Ten?
3. Do you have a Ten merchandise shop or have tyou ever considered opening one?
1. The third ebook of TEN is already published and you can find it in the shop of the publisher.
I made a little tutorial on how to order, because sadly the shop is still German only. =) I hope this helps though: http://ten.smackjeeves.com/chapters/93122/how-to-order-again/ In the description of the tutorial you can find the links to all the English versions of all books and ebooks.
2. Kae is a two book work. But each book has 300 pages instead of 200. ^^ So it's basically the same length as TEN, just in two books.