Use the tools you are used to. I doubt there is much advantage in any particular stack. They seem to catch up to each other. Ruby has some kind of type checker

Use the tools you are used to. I doubt there is much advantage in any particular stack. They seem to catch up to each other. Ruby has some kind of type checker nowadays (can't recall the name). .NET has dynamic types if you need them etc. etc. I like the idea of using Haskell but really I can never be more productive than using my "home stack".