I depends on the field. On VFX/Game world, Dear ImGui seem to be the way to go. Almost all news comer in this field sells Dear ImGui based software. It's fast and light and trivially profilable that's what matter matter for real time applications. And bonus can be integrated in any platform in few hour of devs. Before having any ui in VR or game console (not necessary debug/dev tool) in Qt or anything else it will take ages.