Based on our record, Tigase seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
"Best" is relative but to add to other voices maybe try also looking at Tigase XMPP Server (https://tigase.net/, https://github.com/tigase/tigase-server)? Source: over 2 years ago
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