Google Duo vs WhatsApp

Google Duo
Google Duo is the new, simple video calling app that brings you face-to-face with all the people that matter most.
WhatsApp Messenger is a cross-platform mobile messaging app which allows you to exchange messages without having to pay for SMS. WhatsApp Messenger is available for iPhone, BlackBerry, Android, Windows Phone and Nokia and yes, those phones can all message each other! Because WhatsApp Messenger uses the same internet data plan that you use for email and web browsing, there is no cost to message and stay in touch with your friends. Secure WhatsApp alternatives are Signal and Telegram.
WhatsApp has better video than Google Duo