A lot of folks don’t realize that the Google Drive backup for WhatsApp is not end-to-end encrypted like messages and files within WhatsApp. When that backup to Google cloud happens, all messages and files are visible in plain to Google.
The same problem exists in Telegram, which backs up messages to the cloud. The only exception in Telegram are messages and files sent within their “secret chats” feature, which is end-to-end encrypted. When folks move from WhatsApp to Telegram, it’s important that they understand that this is a step down.
WhatsApp without Google cloud backup is a good option, and even better when WhatsApp’s new end-to-end encrypted backups feature is fully available. If I remember well, it’s available only on iOS at the moment but for some reason that support document doesn’t mention that. Or, is it available for everyone already?
The best option, without doubt, is Signal: it is end-to-end encrypted by default and offers encrypted backups too. One problem with Signal is that it doesn’t offer cloud backups. So, the backups are stored locally on the device.