Syntax wise: Nim is to python what Crystal is to Ruby capability wise both are incredibly powerful genral purpose languages For system language use, Nim is a

Syntax wise: Nim is to python what Crystal is to Ruby capability wise both are incredibly powerful genral purpose languages For system language use, Nim is a better choice as you can use it with its Arc GC or no GC at all. Perf wise, Crystal seems to be marginably faster in most benchmarks. Though at that level the difference isn't much. crossplat wise, Crystal has no windows support while Nim has. Tooling wise; crystal IDE tools are pretty far behind that of Nim. Personally I like Crystal a lot due to its type system and syntax but you can't go wrong with either language.