-
I'd trust Telegram a lot more than Whatsapp
Well there's a hot take.
Telegram rolled their own encryption and screwed it up, more than once. Still don't have verified encryption in place, most cryptographers believe that there's is a bit odd - looks fine, but the oddities are reason to be concerned.
The only messenger with anything is Signal.
But even I'll admit it doesn't have many users compared to WhatsApp or Telegram.
Signal is the only one that cryptographers, government officials, journalists, and other either super paranoid or high risk, actually trust.
Depends who "them" is?
It's generally thought of to be secure (but hard to verify this).
One thing for sure, if you use the Web interface then it's pretty safe to assume that the UK Government has access to the private key of their HTTPS Cert, and so all traffic to/from that site would be readable.
I'd trust [EDIT]
TelegramSignal a lot more than Whatsapp.[EDIT] Just for starters, Whatsapp is end-to-end encrypted, but: