While there may be better options out there, from a purely security standpoint.
The real world, with non-tech people needs solutions that are easy, fast and as close to foolproof as possible.
I choose Signal, because my mum, my sisters and brothers (none of which are tech people) can all go to their app stores and install Signal, it works and it is easy. Signal is private BY DEFAULT, I don’t have to remind them to turn on security for each chat, there is voice and video chat for individuals and groups, I can use it to send files. It is really good. Secure communication is their primary goal.
I have been using Signal since it was called TextSecure and I only had one contact using it.
Yes it sucked when they dropped SMS support; but these days about 98% of my messaging goes through Signal. Any SMS is usually from my doctor/dentist/bank.
I never really trusted Telegram, too many compromises. Secure communication is not their primary goal.
Maybe, but I have had all of my family on Signal for close to 9 years now. Inertia and the network effect is a big part of why platforms stay around.
It took me saying to my mum, that I would ONLY share pictures of her new grandson on Signal to get her to install it. Once mum was on board, the rest followed pretty quickly.
The thought of getting mum to install a new messaging app now, and she is nearly 10 years older. Well it isn’t worth the effort. My threat threat model is low enough, to choose the convenience/security slider at Signal.
As a side note, every month or two; another of my contacts shows up on Signal. I have around 50 contacts using Signal now, as I said before around 98% of my messaging is through Signal.