I'm assuming you mean Converse.js? https://conversejs.org/
There's also Movim: https://movim.eu/
Both do OMEMO. The latter option is fairly new and experimental, can be added as a PWA on mobile.
If it's your own server for a few people, and there's reasonable trust that the server isn't compromised, TLS could be "good enough". (Plus if you run your own server, the TLS version support can be tightened and other hardening tweaks)

Otherwise "Monocles Chat" for a better-maintained Conversations fork (Android native application): https://f-droid.org/en/packages/de.monocles.chat/

If Movim is used, I'd recommend a self-hosted install of it, as I think the Movim backend handles the actual XMPP C2S connection to the server.