The verdict
If your customers already prefer WhatsApp and you keep losing conversations, I'd pick WhatsApp Business, starting with the app and moving to the platform when volume grows. If customers and staff keep asking questions that are already answered somewhere, pick Document360. They fit together. Good articles mean fewer repeat questions arriving in any channel. On cost, the platform charges per delivered template message, by category and by the recipient's country, so model your real message mix. Document360 is quote-based. Keep an email or live chat fallback, because Meta sets the rules and pricing and can change them.