Pros and cons as usual. I worked with both languages professionally but I personally find OCaml more practical, better at programming in the large and easier to write maintainable code. It's a simpler language overall (side effects, strict evaluation). I find the language finds sweet spot between these attributes whereas Haskell is more abstract.

That being said, Haskell is pretty nice as well but I'd pick OCaml for real world stuff.

One thing that bothered me with both these languages is that people not fluent with FP could write code that isn't idiomatic at all. It's probably a bit harder to do in Haskell.