Makestation

Yes, I know that not everyone's using WhatsApp, and it's harder to contact people through it this way.

But now I'm talking about efficiency. And I'll go with WhatsApp Messenger. It is very light and fast, and messages are being sent in a second. It also has more options than Facebook Messenger, which makes it even more worth it.

What about you?

I prefer FaceBook Messenger as I personally find it easier to run, it runs faster on my phone and more people use it.

Same I've found that the Facebook Messenger almost has no bugs and is quite efficient.

Facebook Messenger for me. Never understood the fascination behind WhatsApp.