I'd use something that's truly decentralised but signal is just another walled garden like WhatsApp. Just one that promises to behave better. But what's a promise worth these days?
A decentralised network would mean a guarantee that they can't do anything bad. I'll take that over promises and good intentions any day.
I don't care about the masses. If signing up for a matrix account is too annoying for them they don't really care about privacy anyway. After all it's the same they have to do for any online shop. Just create a username and password. Somehow it's not a problem for the masses if they wanna order a phone charger but for matrix it's suddenly 'too complicated'?
Remember how everyone jumped on Google when they promised to do no evil? Now they're one of the most abundant mass surveillance companies in the world and we can't move away because they're too big to fail.
Signal is one sale away from being evil too. They might not do it but we've been conned so many times that I will only take technical guarantees, not promises that can be broken.
And really, lots of progress is made in real open communications. Matrix is getting more mature by the day. NATO uses it, the French government and several others. And the good thing is, you can always run your own server and connect to the hive. Nobody can tell you what to do, nobody can tell you to surveil your users like the EU is planning to do.
We need something truly open. Not a WhatsApp light.
For me the difference is in the ownership. Who owns each. Which is BigCorp? That’s why I trust one more than the other.
Since when is giving out your phone number a "more private" option ?