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Can't speak for the creator, but generally speaking OCaml is much more widely adopted than SML (although still tiny market share overall). A few corporate players like Facebook and Jane Street have started adopting OCaml, and subsequently the libraries available for OCaml are far superior to SML. As far as I know, SML only remains in use today in academic circles.

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It's hard to imagine that OCaml's libraries/tooling would be the game changers (drop in the bucket by comparison to the vast JS ecosystem). Would be nice if SMLtoJs compiler got the corporate backing though.

OCaml has pretty good and modern tools (opam, meriln, oasis) and basically all the libraries you would expect, compared to SML which has no editor support, a very minimal stdlib, no package manager, no build system, very few and hard to find libraries, etc.

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