I agree Signal’s default security is a whole lot better than iMessage, which trusts Apple for key exchange and makes it impossible to verify the parties or even the number of parties your messages are being signed for. Default security is super important for communication apps because peers are less likely to tweak settings and know about verification screens.

Aside: Signal data never touches iCloud Backup (https://support.signal.org/hc/en-us/articles/360007059752-Ba...). That’s an improvement over a lot of apps.