[catherd]

I believe it's the only major protocol that doesn't rely on google services for push notifications on Android and also has clients available in the app store on iOS.

So if you want to, for example, chat with people in China and avoid WeChat it's a pretty solid choice. Or if you just want to avoid google services.

That said, the clients available on iOS are lacking features you would really need in a business context. Conversations on Android is pretty good out of the box.