People gave you the part in favor of bucklescript, so I'll give you the other side of the story: bucklescript doesn't respect the OCaml memory model and runtim

People gave you the part in favor of bucklescript, so I'll give you the other side of the story: bucklescript doesn't respect the OCaml memory model and runtime semantics, which makes it incompatible with some part of the ecosystem. Js_of_ocaml already has various features that bucklescript doesn't have: dynlink, support for concurrency libraries such as lwt and async, etc. It's also much more stable and battle-tested.