It depends on the devices you are comparing and your needs. My 6" Mentor was next to unusable for reading scanned image type PDF books. My 5" JBL works much better for the purpose. The Mentor added a margin around all images and text on any kind of book. The JBL can be set to not do so. There are many factors that have to be considered besides screen size, such as ease of use, features like zoom, contrast, resolution, speed, battery life, etc.
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