When comparing Messenger vs Sliding Explorer, the Slant community recommends Messenger for most people. In the question“What are the best Material Design apps?” Messenger is ranked 22nd while Sliding Explorer is ranked 29th. 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 Material Design
Sliding Explorer is designed following Google's Material Design guidelines.
Pro Root access
Sliding Explorer has root access support for editing root files on a device.
Pro ZIP support
Sliding Explorer features ZIP file support for compressing and extracting .zip files.
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 Has trouble reading external SD cards
Sliding Explorer has users reporting that there is trouble with it reading external SD cards.
