The EFF took a look at today’s most popular services and compared them all.
In regards to first party messaging services, FaceTime, iMessage, and Google Hangouts ranked fairly well.
Secure Messaging Scorecard| Electronic Frontier Foundation
See How Secure Most Messaging Services Really Are with This Scorecard
If you're wondering how secure the messaging apps and tools you use every day are, this scorecard from the nonprofit Electronic Frontier Foundation
