Enjoying Obsidian at the moment, will keep an eye on this one too, but honestly can't justify the switch away (note-taking is such a habit-based, "flow" tool) unless there's a _significant_ advantage to Dendron.
I guess everyone values something different. I am happy to pay for these tools, and even have them closed-source, as long as
(1) it can run locally, "offline", and (2) the format is open (index-able text, whether one file or many)