It could use a bit more explanation, but I like Matrix because of its structure:
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you have the normal chat function
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group functions
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you can create rooms and spaces for larger topics
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you have a direct overview of whether the files in the chat are safe
This is also very handy for me in the family area, because I can divide and separate different topics in such a way that I can avoid a longer topic taking up entire chat groups that are actually meant for something completely different.
Matrix in particular always gives me the feeling of having a messenger with a forum where I can communicate and socialise both locally and internationally.
It's also my file-sharing app (as it's pre-installed on Linux), as Warpinator is only available for Android.
But yes, I would definitely recommend Signal for its speed of use, Threema is more or less the same but with a premium. With Matrix, you need to get used to it before you can use all the functions.
Sorry, I mean from the OP of course. A little bit about the special features, functions and the company behind it, so that users can categorise the various app suggestions a bit and perhaps also know that there are definitely differences between Signal, Threema and Matrix/Element.
But as a committed Matrix/Element user, I am glad that Matrix/Element is finally a real recommendation. :D