In no particular order: - significant whitespace and no `let ... in` which makes for a more streamlined syntax - no +. vs + - a solid standard library - much improved tooling (see the ionide plugin for vscode) - you can use all the .Net libraries - multicore support - list comprehension and iterators - object support with a minimalistic syntax (I don't include type providers as I never had proper use cases for them)

All of those either remove pain points (some of them arguably very small) or introduce improvements that are sensible in day to day life.

With that and the fast that Ocaml and F# can (for the most part) easily be transpiled into one another, nowadays I see very little reason not to use F#.

That being said, I find the fact that you basically never need explicit types in Ocaml very elegant (in F# the uniform syntax mean that you will need occasional types hints to disambiguate operations).