We use Qt at work for one of the big projects, and we are very happy. That to be said, juce is small, embeddable (your executable can be around ~600kb on window

We use Qt at work for one of the big projects, and we are very happy. That to be said, juce is small, embeddable (your executable can be around ~600kb on windows), and while you can statically link to Qt it's still bigger, and some things don't work right (plugins).