I'd say they have different use cases. If you want to develop native-looking or information-dense UIs, Qt Widgets is the way to go. If you want to create a mor

I'd say they have different use cases. If you want to develop native-looking or information-dense UIs, Qt Widgets is the way to go. If you want to create a more Electron-like UI or develop something for mobile devices, I'd go with Qt Quick. It's also possible to combine both by embedding a QQuickWidget[0] inside a Qt Widgets application. If you want to get an idea about what both solutions provide, take a look at the examples for Qt Quick[1] and Qt Widgets[2]. Especially Qt Quick Controls[3] are useful to see what UI controls are available in Qt Quick. I'm working on a desktop app in Qt Quick using QML and C++. Happy to elaborate if there's interest. [0] https://doc.qt.io/qt-5/qquickwidget.html https://doc.qt.io/qt-5/qquickwidget.html [1] https://doc.qt.io/qt-5/qtquick-codesamples.html https://doc.qt.io/qt-5/qtquick-codesamples.html [2] https://doc.qt.io/qt-5/qtquickcontrols2-examples.html https://doc.qt.io/qt-5/qtquickcontrols2-examples.html [3] https://doc.qt.io/qt-5/examples-widgets.html https://doc.qt.io/qt-5/examples-widgets.html