ReasonML is a syntax and a set of tools. If you prefer the OCaml syntax, by all means use that. If you prefer the standard OCaml tooling, by all means use those. A few reasons to look at Reason might be:

- It gets rid of syntax ambiguities like the 'dangling else' problem

- It introduces conveniences like line comments and JSX

- The tooling includes Esy, which offers an npm-like package management experience including lockfiles and build artifact caching for faster builds across projects

- The community is nice, close-knit, and helpful.