It would depend on my use case, I would take into consideration XMPP, Jami, Briar, Self-hosted Mumble, Jitsi, Rocketchat, Self-hosted IRC.
Not all are exactly decentralized and e2ee, a handful are, but those are just what I’d personally consider. Some have different use cases. Some are easier to use than others, for example I’d probably not invite normie friends to IRC, but would consider the other options. Some may not be the best for group voice chat, Mumble is my preference, although not e2ee, it is encrypted. I wouldn’t completely trust unless it was a self-hosted server or I trusted the hoster. Do some research and choose what works best for you and fits your needs.
which ‘truly private […], decentralized, foss, e2ee’ communication method do you prefer?
It would depend on my use case, I would take into consideration XMPP, Jami, Briar, Self-hosted Mumble, Jitsi, Rocketchat, Self-hosted IRC. Not all are exactly decentralized and e2ee, a handful are, but those are just what I’d personally consider. Some have different use cases. Some are easier to use than others, for example I’d probably not invite normie friends to IRC, but would consider the other options. Some may not be the best for group voice chat, Mumble is my preference, although not e2ee, it is encrypted. I wouldn’t completely trust unless it was a self-hosted server or I trusted the hoster. Do some research and choose what works best for you and fits your needs.