When comparing difftastic vs Sublimerge, the Slant community recommends Sublimerge for most people. In the question“What are the best diff tools for Git?” Sublimerge is ranked 15th while difftastic is ranked 18th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Can diff directories
Pro Syntactic diffing
Down to a character.
Pro Cross platform
Linux, Mac and Windows.
Pro Supports over 20 languages (and some other syntax)
c, c++, c#, java, python, go, javascript, json, rust, sql, html, css and more.
See here.
Pro Language autodetection
Pro Has a manual
Pro Supports other version control tools
Like Mercurial.
Pro Works with Magit
Pro MIT license
Pro Has syntax highlighting
That can be turned off.
Pro Three-way diff allows easy merging of files
Pro sublimerge
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
Cons
Con Can be confused with syntax at times
Con Bad tech support
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.