F# is the most mainstream of the 3. If you can live without the fancier type-system features (trust me, you probably can!) it's the easiest ride.
In practice you have to use a lot of C# class based code, which brings an inherent mismatch to the functional model and makes code look more like a multi-paradigm language like Scala.
The tooling and ecosystem is great (though not as good as for C#, obviously...), the language has some very nice features and design decisions, but you have to live with a somewhat messy reality.
In practice sticking to C# is probably wiser.
When I (an utter beginner in it) code in F#, I miss ReSharper a lot. I wish there were an IDE extension with features similar that of ReSharper but for F# rather than C#.
And a talk from Don Syme, the author of F#, on good F# code as they see it [2]. It's a great talk overall and they specifically address OOP's good and bad bits starting from about 39:00.
1: https://eiriktsarpalis.wordpress.com/2017/03/20/why-oo-matte...
Personally, as an Ocaml coder, I make extensive use of Ocaml's fancier type-system features and would be sad to lose them.
One could argue that not only you can, but you should (for the sake of having more readable programs).