[Risord]

Unlike Elm, F# is 'functional first' but supports OO and impurity (with good and bad).

Biggest clear plus is maybe full stack development support. Checkout SAFE stack (Saturn + Azure + Fable + Elmish).

There is also Bolero, an alternative for Fable how to run F# in client side. Where Fable compiles F# to JS, Bolero relies on Microsoft Blazor project which has a whole .Net runtime on WebAssembly allowing to run .net binaries directly on browser. I think this is still quite experimental but if you need/want some dependencies from .net ecosystem it might be easier than you think.