Comment by ultramancool

It's a toss up:

- WhatsApp uses reputable cryptography from reputable sources, but combines it with a UI so much designed for ease of use that it throws out the possibility of real security

- Telegram uses extremely questionable cryptography to begin with from people who probably shouldn't be designing cryptosystems

If you want real security, go use Signal or better, OTR where socialist millionaire's is still an option for key verification.