Bird CRM, replacing the former MessageBird, is a CRM for Marketing, Sales, and Payments, powering messages to customers across Email, SMS, and WhatsApp.
24sessions is perfect for appointments such as coaching (my use case) where you want them to be able to go into your booking calendar, choose a time and schedule the appointment - or to schedule it from your end. They they get an email on creation and reminder email. I find it not helpful or at least, not at all intuitive, for setting up a host created meeting immediately. You can create it so you can be live at anytime, but host created isn't as any to set up
Regarding WhatsApp Business, it is a very useful tool because templates can be programmed for the entire organization and clients can also be referred to other users in order to decongest an agent who can become quite busy. Otherwise there would be no way to serve you through two agents and you could have a bad end user or customer experience.