When comparing DiffView vs Sublimerge, the Slant community recommends Sublimerge for most people. In the question“What are the best plugins for Sublime Text?” Sublimerge is ranked 26th while DiffView is ranked 42nd.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Flexible diffs for Git, SVN and Bazaar
Pro Auto-detects the repository to use from the current active file
Pro Quick navigation from one change to the next, or search for diffs in a specific file
Pro Side-by-side view with differences highlighted
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 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.