For better MP4 or MP5 e-books, you can refer to the following suggestions: E-book readers usually have a large storage space, can store a large number of e-book files, and support a variety of reading modes such as horizontal screen, vertical screen, full screen, etc. It is convenient to browse and search for books. Some e-book readers also have a bookmark function to help users save their reading history and automatically classify books. The screen resolution, font size, color, contrast, and other factors of the e-book reader must also be considered to ensure that the e-book reader can clearly display the content of the e-book and have a good reading experience. Based on his own experience, it was best to choose an e-book reader with a large storage space, support for multiple reading modes, a bookmark recording function, a high screen resolution, and a moderate font size and color contrast to ensure a good reading experience. In addition, you can try different brands and models to find the most suitable product for yourself.