PS: the app is an IDE that connects to remote Smalltalk backends.
Electron is stable and has figured out all the quirks of delivering apps to windows and macos (packaging, signing, notarizing, etc.) which are a massive pain in the butt. The memory usage is terrible, but at least, you can deliver something.
I can say that the ecosystem around Tauri is pretty darn good, despite how early it is, and Rust at the back is encouraging to me at least -- I'm much happier to write the back bits in Rust than anything else.
I planned to write an article about it (what I ran into, the architecture that worked for me to support multiple platforms with reusable parts, etc), but haven't.
Unfortunately I haven't tried Node-GUI so I can't comment on it.
There's the fundamental difference of how they work though -- Tauri is webviews and Node-GUI is rendering to QT so I think this is maybe the biggest axis to evaluate against.