[substation13]

Many believe that F# is better for functional code and C# is better for imperative code. Hence F# immutable core and C# immutable shell.

But I think this is a myth. F# the language is better than C# at most things and certainly better overall. If you are going to use F#, you may as well go all in and get all of the benefits.

For web services, Giraffe or Suave combinators are much easier to reason about than ASP.NET MVC patterns.