The Bubok ISBN say that Bubok is the editor of your book, and can access to the editor rights if it need it any time. The autoedition ISBN say that you are the author and editor of your book.
If you choose that your book have a Bubok ISBN, it'll have a Bubok prefix.
If you prefer to manage an ISBN on your own, the ISBN Agency will grant you an autoedition ISBN.
Did you know...... it's better to order a printed proof copy of your book before setting the status to "public"??
To make sure your book prints properly and avoid any font, image and other content issues we recommend you order a print copy before setting your book available to public.