You're coming up exactly what he said. I'm not exactly thrilled about Hangouts supposedly showing down in June. My family and I all use Hangouts the other for IMing and videoing together. I really hope they don't shutting us down anytime soon. Yeah, the biggest difference in Duo versus Hangouts is on the web, you can do a one-to-one duo video call from the web,but you can't do a group call from the web interface of Duo. Hangouts lets you do this.