I can only speak to the iOS versions. They are pretty similar to most reading apps. A few font selections -serif and sans serif. A few background options like night mode and sepia. Scribd books are right justified, and Oyster books are not. It's probably a personal preference which one people like better. Neither have margin nor line spacing options. They have bookmarks, notes, highlights, dictionary. Information syncs between your different devices so you can pick up reading where you left off. You can set-up your account so you have a bookshelf with what you're reading and another list of books you want to read. Oyster also has a shelf for books marked as read and a favorites list.
|