When comparing Messenger vs Google Play Books, the Slant community recommends Messenger for most people. In the question“What are the best Material Design apps?” Messenger is ranked 22nd while Google Play Books is ranked 65th. The most important reason people chose Messenger is:
Allows communicating with anyone who's a friend on Facebook.
Specs
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Pros
Pro Uses Facebook friends to create a contacts list
Allows communicating with anyone who's a friend on Facebook.
Pro Read receipts
Can see who has seen each message in group messages.
Pro Easy to share posts from Facebook
Integration with Facebook makes it easy to share any interesting posts from the Facebook timeline.
Pro Great UI
User interface of the application is clean, intuitive and easy to overview.
Pro Allows bookmarking pages, highlighting text, and adding notes
Google Play Books offers many options while reading such as bookmarks, highlights and notes. Making for a good app to use for academic .pdfs and .epubs.
Pro Built-in dictionary
Google Play Books has an inbuilt dictionary for users to use to look up unfamiliar words.
Pro Supports PDF & EPUB uploads
Users can use the Google Play Books webpage or app to upload their own .epubs or PDFs.
Pro Font, font-size, layout and theme can be customized
Margins, text size, line spacing and color theme of the page can be changed to the users liking,.
Pro Syncs across devices
No matter what device one is using the Google Play Books service on it will sync all eBooks and placement into the cloud.
Pro Immersive mode
Google Play Books has built in immersive mode when reading. This allows for the navigation and notification bars to be hidden, allowing the full screen to be used for the eBook.
Pro Responsive interface
Like the majority of Google's apps, Google Play Books has a slick interface that works quite smoothly.
Pro Has light and dark themes
Google Play Books offers a dark and a light theme to make it easier to read in dark or light rooms.
Pro Books can be bought or rented directly from the app
Google Play Books has an in built eBook store within the app, making for a convenient way to purchase titles.
Pro Has text-to-speech support
Text to speech can be used to have an eBook read to the reader aloud.
Cons
Con Lack of privacy
Messenger is owned by Facebook. Based on their privacy policy, this means that any information you provide (including messages sent) are used by Facebook to profile you and sell access to your data to advertisers.
Con Lack of end-to-end encryption
Secret (end-to-end encrypted) chats are only supported in one-to-one messages, and are not enabled by default, and the encryption has not been verified independently.
Con Lacks library management features
No shelves, categories, or reading lists.
Con External SD card
Google play books doesn't have the ability to save the downloaded books to an external SD card.