Session is based on nodes that stack a shitcoin, it is not sustainable over time, and setting up a Session node is not accessible to everyone.

Session works poorly.

Session has a unique identifier where it can trace you.

SimpleX is not a blockchain, so it works very well. It also has audio and encrypted calls.

It is decentralized and you can set up your own server in 5 minutes.

SimpleX has no traceable ids.