When comparing SmartSynchronize vs DiffMerge, the Slant community recommends DiffMerge for most people. In the question“What are the best folder/file compare/diff tools for either OSX, Linux or Windows?” DiffMerge is ranked 8th while SmartSynchronize is ranked 18th. The most important reason people chose DiffMerge is:
DiffMerge is free of charge to download and use for both commercial and open source projects. There's no license needed. However, people who want to contribute to the project monetarily [can do so](https://www.sourcegear.com/diffmerge/register).
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Freely editable views
Pro Can remember directory compare locations
Useful if you need to perform comparisons again later.
Pro Available for Windows, Linux, Mac
Pro Completely free
DiffMerge is free of charge to download and use for both commercial and open source projects. There's no license needed. However, people who want to contribute to the project monetarily can do so.
Pro Cross platform
DiffMerge is cross platform and is available for all major operating systems. This means WIndows, Linux and OSX
Pro Folder compare
Pro Three way merges
DiffMerge supports three way merges.
Cons
Con It's not free
Con Startup time can be slow
DiffMerge's startup time can be quite slow sometimes.