When comparing GTK+ vs Electron, the Slant community recommends GTK+ for most people. In the question“What are the best cross-platform GUI toolkits?” GTK+ is ranked 8th while Electron is ranked 12th. The most important reason people chose GTK+ is:
Ranked in these QuestionsQuestion Ranking
Pro Language bindings
Pro Nicer user interface when using PyGi
Creating cross platform enterprise apps with PyGi and with the help of Gtk Themes makes them look great.
Pro Active development
Electron receives updates frequently (multiple times each month). For example, the recent updates (as of July 15, 2016) are:
1.2.6 (released July 6)
1.2.5 (released June 23)
1.2.4 (released June 22)
1.2.3 (released June 16)
1.2.2 (released June 8)
Pro Healthy community
Github is behind electron and there is a lot of big companies using it to make their cross platform apps.
Pro Great documentation
Electron has a nice website with great documentation. It also features a lot of samples.
Pro Solid API
Con Terrible Integration
Looks and feels like an alien on all other platforms than GNOME.
Con Needs to run chromium
Runs chromium in the background which consumes a lot of resources.
Con Apps can have memory issues
Apps made with Electron are likely to have memory issues unless you specifically design the app with efficient coding.