Personally I think learning functional programming with OCaml is a bit harder than with Erlang (twitter) but it comes at a good trade off because that additional difficulty comes from being statically typed (with a sound type system) and is mitigated by excellent type inference.
But OCaml is also more practical and therefore easier than Haskell (twitter) because functional purity is not dogmatically pursued (i.e. immutable by default but there are escape hatches), there is no laziness to deal with and monads and category theory don't come up at every turn.
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If you are interested in exploring functional programming for yourself then keep an eye on Introduction to Functional Programming in OCaml (twitter) just in case they start another session in September/October.
Why OCaml?
Who's using it? (example: Jane Street).
While it's unlikely that most people will ever earn money with OCaml it's a good basis for other dialects like F# (.NET; Scott Wlaschin: F# for Fun an Profit, Domain Modeling Made Functional) and ReScript (front end).
Personally I think learning functional programming with OCaml is a bit harder than with Erlang (twitter) but it comes at a good trade off because that additional difficulty comes from being statically typed (with a sound type system) and is mitigated by excellent type inference.
But OCaml is also more practical and therefore easier than Haskell (twitter) because functional purity is not dogmatically pursued (i.e. immutable by default but there are escape hatches), there is no laziness to deal with and monads and category theory don't come up at every turn.