The verdict
If you are a very small store answering a handful of chats from a phone, the WhatsApp Business app is enough to start. It gives you a business profile, a catalogue, greetings and away messages. Once more than one person answers, and agents are copying order numbers between tools, pick Gorgias and bring WhatsApp into it.
If you do not sell through a store, Gorgias will carry features you never use, and a general helpdesk fits better. Remember that you build on Meta's rules for templates, consent and pricing. Check that WhatsApp is supported on your Gorgias plan before you migrate.