When comparing Qt Creator vs qemacs (for quick emacs), the Slant community recommends Qt Creator for most people. In the question“What are the best programming text editors?” Qt Creator is ranked 19th while qemacs (for quick emacs) is ranked 42nd. The most important reason people chose Qt Creator is:
Qt Creator has a code model which basically has the same information as the compiler. So it can do really nice syntax highlighting (e.g. of virtual methods or local variables) as well as provide great code completion.
Specs
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Pros
Pro Great syntax highlighting and auto-completion
Qt Creator has a code model which basically has the same information as the compiler. So it can do really nice syntax highlighting (e.g. of virtual methods or local variables) as well as provide great code completion.
Pro Integrates well with non-IDE workflows
Qt Creator uses normal .pro-files, CMakeLists.txt, Makefiles.am, etc. for its projects and rarely needs special configuration for projects.
Projects can be built on the command line as usual.
Pro Built-in Qt GUI editor
Allows for the creation of a window based UI in a graphical editor, no code required to build the UI.
Pro Fast and fully keyboard-navigatable
Responsive UI, no need to use the mouse for the power users.
Pro Supports CMake
Pro Very responsive when compared to similar software
Pro Much space dedicated to the code
Small and beautiful UI, almost all the space is dedicated to the text with hardly and toolbars. Can actually be used on a 1024x768 pixel screen.
Pro Input methods for most (human) languages
Including e.g. Chinese.
Pro Terminal and graphics mode
Supports the terminal mode with 'qemacs -nw' and a graphics mode.
Pro Good documentation and help
- Context sensitive shortcut help on F1.
- Good online documentation.
Pro Comfortable file browser
Easy to open and manage files (dired-mode).
Pro Supports many editing modes besides text
- Hex
- HTML / CSS
- Image
- Audio/video (maybe not the most sought after mode in a text editor, but, well, it's there)
Pro Full UTF-8 support
Including bi-directional writing.
Pro Super lightweight and fast
Pro Emacs like key-bindings
Use your muscle memory if you know Emacs already.
Cons
Con Poor refactoring
QtCreator has lack of refactoring features. It's not even close to Resharper++ or CLion.

Con Poor multi-window mode support
While multiple windows are supported, many operations will activate in the primary window (debug, goto-line... etc).

Con Qt-focused
Qt Creator is focused on being an IDE for Qt, as a general purpose IDE it performs quite well, but there are areas which are lacking such as project file support (support for generic/CMake projects lags behind Qt projects).
