Their architectures differ a lot and nowadays you can use XMPP with HTTP via BOSH. I think a fair comparison is the one in the Matrix FAQ: https://matrix.org/d

Their architectures differ a lot and nowadays you can use XMPP with HTTP via BOSH. I think a fair comparison is the one in the Matrix FAQ: https://matrix.org/docs/guides/faq.html#what-is-the-difference-between-matrix-and-xmpp https://matrix.org/docs/guides/faq.html#what-is-the-differen... Disclaimer: I prefer XMPP.