When comparing Sublimerge vs QtCreator/Qt, the Slant community recommends Sublimerge for most people. In the question“What are the best Linux diff tools?” Sublimerge is ranked 4th while QtCreator/Qt is ranked 12th.
Ranked in these QuestionsQuestion Ranking
Pro Three-way diff allows easy merging of files
i recommend Sublimerge
Pro Highlights intraline changes
Pro Built-in support for Git, Subversion and Mercurial commands
Sublimerge automatically integrates with your version control history, and lets you compare between revisions, branches, remotes, and the staging area.
Pro Can compare to clipboard contents
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.
Con It's NOT Open Source
You can't fix or, implement nothing. And when the developer abandons the project you will be left in the lurch.
Con It's not free
Nither as free price nor as free in freedom.
Con Cannot compare text within the same file
Sublimerge can only compare entire file diffs, but not two selections within a file. Comparing within files can be useful for example, by refactoring two similar functions to use a shared function. With Sublimerge, you need to copy the sections into two new temporary tabs and compare between the two. This can be cumbersome, as if you have another untitled file, you won't be able to know which one is which.
Con No version control integration
Con Vendor lock on QtCreator
It's not simple at all to use Qt in a different IDE, and you'll lose QtDesigner.