There's also a big thing where WhatsApp is way ahead of WhatsApp: Multiplatform: You can use native telegram apps in iOS (both iPad and iPhone), Android, macOS

There's also a big thing where WhatsApp is way ahead of WhatsApp: Multiplatform: You can use native telegram apps in iOS (both iPad and iPhone), Android, macOS, Linux and Windows. That's huge compared to WhatsApp. Also, Telegram is not as dependant on the phone number as WhatsApp is. Once you have a username it becomes easier to set up new devices.