Earlier quoted context omitted.
They are completely different. One of them lets you have the sexy blue text boxes in iPhone group chats, and the other makes everyone see you with the green box of shame.
Unless you live outside of the US in which nobody gives a damn and they all use WhatsApp. After moving, I only get sms messages from the doctors office and my friends back in America.
This is such a ridiculously incorrect over-generalisation. China, Japan & Russia are obvious counter-examples, plus many others.