Lastly, you should consider that Qt provides many integration options for all its graphic frameworks. This means that, in the same application, and even in the same UI, you could potentially mix Qt Quick controls, Qt 3D components, and Qt Widgets controls. We will see an example of this kind later on. Whether this makes sense is again a matter of taking a good look at the usage context and at the available technologies.
Also, if you find a clean way of structuring your application, as I am advocating here, you should be able to swap the UI layer later in the project without suffering too much, just a bit.