There are other nice things about Rust over OCaml that are mainly just due to its popularity. There are libraries for everything, the ecosystem is polished, you can find answers to any question easily, etc. I don't think the same can be said for OCaml, or at least not to the same extent. It's still a fairly niche language compared to Rust.
I remember about 5 years ago, StackOverflow for OCaml was a nightmare. It was a mishmash of Core (from Jane Street) Batteries, and raw OCaml. New developers were confronted with the prospect of opening multiple libraries with the same functionality. (not the correct way of solving any problem)
