When comparing QtCreator/Qt vs vimdiff, the Slant community recommends vimdiff for most people. In the question“What are the best Linux diff tools?” vimdiff is ranked 2nd while QtCreator/Qt is ranked 14th. The most important reason people chose vimdiff is:
It's practically vim, this means that the whole interface is mouse-free, this increases development speed significantly since you are only using the keyboard.
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Pros
Pro Visual GUI designer
QtCreator has QtDesigner component, allowing you to design a GUI in visual mode instead of raw code.
Pro Ready-made classes for most used tasks in desktop app development
Launching external applications, getting environment variables, putting tasks to separate threads, offscreen painting, transparent loading of most used image formats, even such helpers as opening files in default application configured in OS, cross-platform (!).
Pro Cross platform
Qt supports most popular platforms including Linux, FreeBSD, Windows, and Mac OS X. This allows developers to easily port applications to different platforms.
Pro Mouse-free interface
It's practically vim, this means that the whole interface is mouse-free, this increases development speed significantly since you are only using the keyboard.
Pro Lightweight
Since it's inside vim, it's very lightweight and fast. It fires up quickly and it does all operations painlessly.
Pro Helpful to people who work a lot inside the terminal
Using command-line tools (vim/git) keep you stick in the terminal.
Cons
Con Vendor lock on QtCreator
It's not simple at all to use Qt in a different IDE, and you'll lose QtDesigner.
Con Big overhead
Con Not for people who are not used to vim
Since this is basically a vim feature, it's clear that people who aren't used to vim and it's keyboard-based interface would find it very hard to work with vimdiff.