I am using QtCreator for development of my Qt applications because I it better fits the Qt classes as such. However I use Visual Studio for Debugging those projects.
Qt-Creator:
- better Qt object support (help, navigation, etc.)
- better GUI editor
- some nice features like mouse navigation
- really fast IDE
- poor debugging (at least I don't know how to efficiently use it here) compared to VS
Visual Studio (+Visual Assist):
- great debugger
- Visual Assist
- easier project file configuration and customization (qmake is way too limited in some areas)
- Visual Studio is my choice for C++ development (I'm used to it)
- Qt integration is not that good (IMHO)
