Windows support (plus more compile options in general), different GC options, more options for parallelism, more libs (both standard + user), etc... Not necess

Windows support (plus more compile options in general), different GC options, more options for parallelism, more libs (both standard + user), etc... Not necessarily 'lacking' if Nim didn't exist, but lacking in comparison. And for a bleeding edge GC'd statically-typed language that compiles using LLVM I think Pony is more interesting than Crystal, also Ruby-ish syntax.