When comparing Messenger vs Amaze File Manager, the Slant community recommends Amaze File Manager for most people. In the question“What are the best Material Design apps?” Amaze File Manager is ranked 1st while Messenger is ranked 22nd. The most important reason people chose Amaze File Manager is:
Amaze File Manager is an opensource file manager.
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 Open source
Amaze File Manager is an opensource file manager.
Pro Material Design and fast operation
Amaze File Manager follows the Material Design guidelines as well as operates very fast.
Pro Built-in FTP server
That's an easy way to access your phone filesystem from another device. But be careful when using it on untrusted networks, because FTP protocol has encryption.
Pro Light and dark themes
Pro Light on resource consumption
This app has a very specific purpose - browsing and interacting with your files. It remains light (no incurred battery usage) and doesn't pollute your phone with new apps to open your files but instead uses your default applications for that.
Pro Built-in SMB client
Amaze File Manager can connect to SMB shares (AKA samba, AKA window shared folders).
Press the "+" button, then "Cloud connection", then "SMB Connection".
Pro Built-in root explorer
If your Android device is rooted, you can use this app to access system files.
Pro Great customer support
Support is available 24/7. Your emails will be answered within 24 hours.
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 Slow
Con SMB and SFTP fails
Failed to connect to server using either SMB or SFTP.
Con Cannot do file actions in ZIP packages
You have to extract all files from "package.zip' package to a new folder 'package' if you want to view a single file.
Con No networking tools
Sadly there are no networking tools built into Amaze File Manager.
