The only reason I sometimes use WhatsApp is that I get [video] calls through it... from people who either don't use Telegram or Telegram is blocked in their country (and WhatsApp isn't).

Telegram has tons of more features, and of course, their focus on security, privacy and freedom is much appreciated. And the fact it's blocked in some countries is actually more reason to use it :)

I do agree with your argument about its being blocked in some countries; I wanted to point out that makes it less easy-to-use for the less savvy users. And that can result in less adoption of it.

Everybody has whatsapp that forces you to use it for work, but otherwise i use telegram

Exactly, that's the problem with anything "social" — others have to be on it too...