I would say Signal, for now. Since last year when the European Commission urged its staff to switch from WhatsApp to Signal, I've noticed a lot more of my cont

I would say Signal, for now. Since last year when the European Commission urged its staff to switch from WhatsApp to Signal, I've noticed a lot more of my contacts becoming available on Signal. I've been using Signal for some time; I preferred Wire, but gradually it became clear that Wire was only interested in corporate clients. One bonus compared to Signal is that you don't need to tie it to a phone number.