When comparing Package control vs Sublimerge, the Slant community recommends Package control for most people. In the question“What are the best plugins for Sublime Text?” Package control is ranked 1st while Sublimerge is ranked 26th.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Automatically upgrades your packages
Pro Helps you discover new plugins
Package control retrieves a list of plugins from their central server, making it easier to find new plugins.
Pro Enables you to customise and extend Sublime text!
Pro Supports GitHub, BitBucket and a full channel/repository system
Pro Free
Really ease your life for free
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.