Electron still has the most each since you can use it for a web UI as well as mobile. I also suspect more people are familiar with web tech in general, and in my experience it tends to be easier to work with. The workflow can be quite nice as well. I find hotloading to be especially nice when working on UIs since you can get the app in a particular state and tweak it without having to rebuild the state each time. This talk is a good example.