Both platforms had their own unique advantages. The specific choice should depend on individual needs and preferences. Dangdang was a leading e-commerce company with a wide range of products and a wide selection of books. The company also provides some unique features such as online customer service and order tracking to help better manage orders and solve problems. Amazon was a world-renowned online bookstore with a rich book product line. In addition, Amazon also provides some unique features such as automatic book search and online search to help you find the books you need more easily. Therefore, if they needed a wider product line and more choices, Dangdang might be more suitable. If you need more help and order tracking, or like Amazon's unique features, then Amazon might be more suitable.