WhatsApp Business API is not just an app like whatsapp. It is for the small setup business and enterprises. It provides access to business men to scale their sales and customer support. A normal WhatsApp does not allow to use the API. So, in this case, WhatsApp API is recommended. Broadcasting messages is one of its important feature. It can provide multiple human live chat on unlimited devices with the same cell phones.
Also Read- How do I start a sale on WhatsApp?