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These are two different options that are provided by the WhatsApp platform for businesses. The one you use depends on how big your business is.
The WhatsApp Business App is free for both Android and IoS phones. But wait it is attached to only one phone number and so can be used just by one smart phone. This is perfectly fine for small businesses but not for large business enterprises. To get a WhatsApp business account, you will need to download the business application from the Apple Store or Google Play and then register with a unique phone number.
The WhatsApp Business API is a powerful GDPR compliant tool that is not connected to a specific mobile interface. Instead, it can be integrated with customer CRMs like Salesforce etc. This means that communication can be triggered by specific customer interactions such as purchase of a product etc. However, the WhatsApp API is not free and there are different pricing models that this article will talk about a bit later.
There are lot of things which are related to whatsapp apis and chatbots. Like How to integrate and Automate WhatsApp Click-to-Chat on Your Website. TO know more about whatsapp chatbots and api's, just visit our website. I have written in depth on this topic.