[xenoscopic]

There's no conflict resolution UI at the moment (either graphical or command-line based). Mutagen's conflict resolution is primarily performed via the specification of its synchronization mode (which can automate the resolution of most conflicts) and (in the case where conflicts can't be resolved automatically) by manually deleting the file that should "lose" the conflict (because Mutagen will synchronize a modification over a deletion).

Mutagen provides fairly detailed reporting of synchronization status, file staging progress, and change application problems via its "mutagen sync monitor" and "mutagen sync list" commands. These also support JSON output (and Go-template-style formatting), so you can pipe this information into other tooling. If you need REALLY detailed information, you can look at the debug or trace-level logs from the Mutagen daemon, but that's typically only for debugging during development of Mutagen itself.

Mutagen is somewhere in between Unison and Syncthing on the topology front, but closer to Unison. It still only supports two endpoints per synchronization session, but unlike Unison it doesn't require that one is local (i.e. you can do remote-to-remote sync using your local system as a proxy). But with both Mutagen (and Unison), you can set up a hub-and-spoke topology if you want to sync with multiple nodes.