Barnes and Noble is not helpful for publishing books if you need a signed document to prove copyright ownership over your books. They will not provide it to you even if Amazon is insisting on it. It has the ebook option but no bonus for authors to gain from. Once you publish on their platform, you have to find ways to market yourself if you don't want to use their services. They do not have book advertising options. Amazon is better if you want to be paid royalties for readers who read your books. Nook books don't have this option from what I can see. There is also no expanded distribution of your books, so everything stays within their website. You have to work with another publisher for global distribution. Copyright is a problem when it comes to producing puzzle books that quote a lot of scripture. Amazon also has its issues and both of these I honestly don't like.