I installed Fedora32 yesterday as I was trying to compile an OCaml version 4.10 based application that needed some bleeding edge dependencies.
I found the
dnf (Dandified YUM) package manager was nice to use.
I noticed with OCaml they list over 100
distros and the version of OCaml that is provided in their repositories. It seems that they get their data from
https://repology.org/
It may be one way to get a rough idea of which distros are bleeding edge and which are more conservative, plus. Also, if you scroll down, which repositories don't contain the package you are after.
Some examples:
cheers,
Ian.