The type of printing you choose is greatly dependent on your book genre. Think about the type of book you're trying to create, then assess your wants and needs. For self-published children's books and art books, images are a crucial part of the storytelling process, so it's best to invest in color printing. If you're publishing a paperback book like a novel or memoir, black-and-white printing will do just fine (plus, you can always get a colorful book cover design to entice your readers).