I love Elm, but from a practical place, I think ReasonML is more fruitful to learn because of the fact that any valid ReasonML (sans JSX) is also valid ocaml, so you're nearly learning two languages at once.

https://reasonml.github.io/docs/en/what-and-why

I also feel the same way about F#, if you have any reason to care about C# or the .NET stack. It also can compile down to JS (and targets react)