Onyx Boox Max 2 or Onyx Boox Max 2 pro is recommended. Large screen, 13.3 inch which is similar to the A4 size. 32 GB or 64GB storage could carry many books and it could support many kinds of formats, including Epub, Mobi, Pdf, etc. It is a pity that it does not have a SD card slot to enlarge the storage by users. I have looked a
video posted in Youtube to show the comparison between the Onyx devices and the Manga. I think the biggest one is perfect for reading. It provides the real reading experience.