I get where you're coming from but Telegram is objectively better than WhatsApp due to several reasons:
- Privacy controls for each user.
- No hard requirement for a phone number.
- Cloud encryption.
- Open Source clients.
- Telegram's track record.
- Business model not revolving around selling user data.
WhatsApp is a black box and nobody has any good arguments for it other than 'supposed' E2EE that nobody knows anything about. The fact that WhatsApp's T&C forbid you from even reverse engineering the obfuscated binaries and Facebook being the force behind WhatsApp, I'm still surprised that people take their E2EE claim seriously.
It's like me promising you that I'm not looking at you, while I stand facing you, right behind you.