tbh? neither really scratches the itch anymore.
signal = honeypot w/ a phone# leash and centralized infra.
session = cool concept but oxen’s premine + cloud nodes feel sketch.
if you want *actually* private convos w/o any of that baggage, just grab Vector - fully encrypted via MLS, no phone#, open source, and you can bounce your msgs over nostr giftwraps. gets me every time.