When comparing Messenger vs Chatwee, the Slant community recommends Chatwee for most people. In the question“What is the best team chat software?” Chatwee is ranked 47th while Messenger is ranked 74th. The most important reason people chose Chatwee is:
A bit less options available but works nonetheless.
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 Has a free-forever option
A bit less options available but works nonetheless.
Pro Real-time media and file sharing
Including YouTube videos and pictures preview in the chat window.
Pro Plenty of customization options
Chat size, color, fonts, language, log in methods, notifications, emojis, privacy, powerful moderation and many more.
Pro Single Sign-on
Users, who log in to the site, are automatically logged in to the chat.
Pro Integrated with 25+ most popular CMS
Developers provide easy to follow, clear plugin installation instructions.
Pro Clean design
Chatwee has a clean and easy to use UI. On the left there's a clean and defined user list, each name has a flag next to it. It's also very easy to move from one side of the screen to the other. There's only the most useful information on the screen at any time and the design never feel overwhelming or cluttered.
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.
