EFF compares all messenger apps and publishes the results in Secure Messaging Scorecard link.

note:EFF compares Telegram in secret chats mode with WhatsApp

EFF criteria are:

1. encrypted messages in transit? both,telegram uses MTProto protocol and Whatsapp uses an undisclosed protocol
2. encrypted so the provider can't read it?this criterion requires that all user communications are end-to-end encrypted. This means the keys necessary to decrypt messages must be generated and stored at the endpoints (i.e. by users, not by servers) telegram has this criterion but Whatsapp has not it
3. can you verify contacts' identities? this criterion requires that a built-in method exists for users to verify the identity of correspondents they are speaking with and the integrity of the channel, even if the service provider or other third parties are compromised telegram has this criterion but Whatsapp has not it
4. are past communications secure if your key are stolen? this criterion requires that the app provide forward secrecy telegram has this criterion but Whatsapp has not it
5. is the code open to independent review? telegram has this criterion but Whatsapp has not it
6. is security design properly documented? this criterion requires clear and detailed explanations of the cryptography used by the application telegram has this criterion but Whatsapp has not it
7. has there been any recent code audit? this criterion requires an independent security review has been performed within the 12 months prior to evaluation both have it

finally,the result is that Telegram is more secure than Whatsapp

EFF compares all messenger apps and publishes the results in Secure Messaging Scorecard link.

note:EFF compares Telegram in secret chats mode with WhatsApp

EFF criteria are:

1. encrypted messages in transit? both,telegram uses MTProto protocol and Whatsapp uses an undisclosed protocol
2. encrypted so the provider can't read it?this criterion requires that all user communications are end-to-end encrypted. This means the keys necessary to decrypt messages must be generated and stored at the endpoints (i.e. by users, not by servers) telegram has this criterion but Whatsapp has not it
3. can you verify contacts' identities? this criterion requires that a built-in method exists for users to verify the identity of correspondents they are speaking with and the integrity of the channel, even if the service provider or other third parties are compromised telegram has this criterion but Whatsapp has not it
4. are past communications secure if your key are stolen? this criterion requires that the app provide forward secrecy telegram has this criterion but Whatsapp has not it
5. is the code open to independent review? telegram has this criterion but Whatsapp has not it
6. is security design properly documented? this criterion requires clear and detailed explanations of the cryptography used by the application telegram has this criterion but Whatsapp has not it
7. has there been any recent code audit? this criterion requires an independent security review has been performed within the 12 months prior to evaluation both have it

finally,the result is that Telegram is more secure than Whatsapp