Haskell has a steeper learning curve IMHO: monads are pervasive and are hard to understand, laziness isn't a common programming pattern and it adds complexity. I find type classes confusing as well, it's not always clear where things are defined.

I like that OCaml is close to the hardware, there are no complex abstractions. The module system makes it easy to program in the large (I love mli). If you avoid the more advanced features, it's a super simple language.

Ocaml is more practical, and less punishing (you can do IO without monads), but the most important diffrence is performance. Haskell is VERY hard to make predictable because its lazy. Ocaml is strict so general system performance is much easier to predict.

But they are sibling languages in my book, while i still prefer ocaml over haskell.