Did all depends on your use case friend. I don't like signal because it requires a SIM card and a telephone number.

I mean, that's basically one of the strongest way to identify a device.

Simple X doesn't allow you to have two devices using the same profile. Not sure about session on this one.

Delta chat is super easy, but I'm not quite sure on the encryption. I have to admit it's very easy to use, so that's what I'm using right now.