When comparing Sublimerge vs Compare Side-By-Side, the Slant community recommends Sublimerge for most people. In the question“What are the best diff plugins for Sublime Text?” Sublimerge is ranked 1st while Compare Side-By-Side is ranked 2nd.
Ranked in these QuestionsQuestion Ranking
Pros
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
Pro Simple to use, especially with minimap
Pro Don't have to track file in version control
Having hot keys to jump to next change is nice, and the coloring can highlight the actual changed characters which is great.
Cons
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.
Con No version control integration
Con Line numbers do not mirror those in the source files
Con Slow
Comparing large files (100k lines) takes minutes compared to diff on the command line that takes only seconds.