People are choosing WhatsApp Messenger over Facebook Messenger because of these five differences:
1. WhatsApp needs less bandwidth {connectivity} whereas Facebook is a heavy application that needs good connectivity.
2. Facebook messenger requires a Facebook account whereas with WhatsApp you can just insert your number to get started.
3. The best part is WhatsApp uses end-to-end encryption which makes it more private and safe. On the other hand, Facebook encrypts messages by default from the sender to its server
4. Placing calls on WhatsApp is easy and cost-free. On the other hand, placing calls on Facebook messenger is difficult because most of the time it's on maintenance.
5. On WhatsApp you can delete your messages whereas on messenger you cannot delete your messages.