F# has some nice things in it: I especially like how it handles multiple return values. But compared to the language it is most clearly decended from, OCaml, it

F# has some nice things in it: I especially like how it handles multiple return values. But compared to the language it is most clearly decended from, OCaml, it ties you to .NET Core and it lacks an ML-like module system and macros. If you want to use .NET, F# is a fine choice. But otherwise, and especially in the context of an alternative to Rust, I recommend OCaml.