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 t...
Diffs are only computed when you call it via key bindings, so if you edit the file after generating a diff, the old diff will still be there until you clear it or regenerate it, which can be kinda confusing.
FileDiffs allows you to compare any arbitrary text through multiple commands: Compare the current file or selection with any other file via a file select menu Compare the current file or selection file with previously selected tab or window or panel Compare the current file or selection
After running FileDiffs, it creates a new diff file in a new tab, which doesn't have the benefit of showing the diffs in context. However, it is possible to open the diff in an external diff tool instead of creating a new tab.