* https://telegram.org/faq#q-how-secure-is-telegram
* https://telegra.ph/Why-Isnt-Telegram-End-to-End-Encrypted-by...
* https://telegra.ph/Why-you-should-stop-reading-Gizmodo-right...
For a good UX impl, check out Keybase. It's encrypted chat feels just as good as Telegram's unencrypted chat.
"GPG isn't that hard! You see, you just..."
This debate has taken place over and over again on HN, there's nothing new here.
Surely, that doesn't mean that expert were wrong, but at least mentioning that in Telegram vs WhatsApp debate doesn't look like a strong point.
And like heinrich5991 said, there's no need for backdoor or vulnerability when the data leaks by design to the server.
And no secret chats aren't an option. E2EE needs to be cross-platform and enabled by default. Signal can do it, Wire can do it. Telegram can't, because the developers are completely incompetent.