Ranked in these QuestionsQuestion Ranking
Pro Readable syntax
By using whitespaces and nesting, you don't need braces or semicolons. This helps with keeping the syntax as readable and minimal as possible.
Pro Supports variables out of the box
Sly has out of the box support for variables.
Con Extremely limited adoption
Sly has just 5 stars on Github and a very small adoption rate. For an open source project this usually means less bugs reported, lesser documentation and few third-party learning resources.
Con Not stable
Sly is in the alpha stage.