When comparing Diffy vs Compare Side-By-Side, the Slant community recommends Compare Side-By-Side for most people. In the question“What are the best diff plugins for Sublime Text?” Compare Side-By-Side is ranked 2nd while Diffy is ranked 5th.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Provides inline side by side diffs
Diffy computes a diff between two panels using sublime texts multi panel feature, and highlights the diffs inline.
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 Diffs cannot be cleared if you leave 2 panel mode
If you create a diff in 2 panel mode, then switch to 1 panel mode, the clear diff binding does not work.
Con Diffs don't live update
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.
Con No command pallet entry
The only way to compute a diff is through key bindings, and the default key bindings are ctrl+k, ctrl+d
for diff, and ctrl+k, ctrl+c
for clear diff, which will require some memorization or customization.
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.