Depends on what you prefer. WhatsApp shares your messaging metadata with Facebook. WhatsApp also exposes your phone number to everyone else (for example, in gro

Depends on what you prefer. WhatsApp shares your messaging metadata with Facebook. WhatsApp also exposes your phone number to everyone else (for example, in groups). Telegram does not expose your phone number to others by default, and you can even make sure that phone number enumeration attacks can't be carried out (like the authorities did in Hong Kong last year).