why Signal and not wire? (no sim card needed), No need to allow access to your address book to make group chat. Works in browser, ios, android, desktop app. Using signal protocol. And you can draw in it.
why wire and not lockdown?
why lockdown and not matrix?
why matrix and not IRC on a self-hosted server?
why IRC and not HF packet radio
why HF packet radio and not OTP notes on flashpaper delivered by carrier pigeon?
this is the current problem i have with chat. there are too many options.
I've been using Wire for a few years and the experience is solid. No need for phone numbers anymore, just @handle, and it does multi-device encryption and backup. Its search is very fast, even for large number of messages. Good support for attachments and superb audio and video.
On the flip side, it's not very customizable and doesn't have a lot of the more "modern" UX goodies like emoji reactions or threads. But it's overall very good and I see no reason to change.