@28629284 @e2aff28e 

Threema is a for-profit corporation, whereas Signal is not.
Threema is proprietary, whereas Signal is not.
Threema is a subscription service, whereas Signal is free.

And as for security, Both apps are secure end-to-end. But the phone number is indeed an identifier in Signal. But rest assured... if the NSA has you on their radar, they will have the resources to get to you regardless of what software you're using.