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Are there any major benefits of using Sass over Less ?
A better question is there any benefit of using Less over Sass. As I see it, there's very little. The main reason used to be in-browser implementation, but the upcoming release of Dart Sass will enable that. I honestly don't see any reason to use Less anymore, unless you like the syntax better but it's purely an aesthetic choice at this point. Sass has a bigger community, more robust implementations, and is faster with libSass.