[nailer]

Excellent question! I use both regularly so are qualified to answer:

- monorepo. Versioning over entire repo. node modules are used for granularity, separation of concerns, etc.

- git submodules. Versioning over individual node modules. node modules are used for sharing code.

Nothing stopping you from using both.

Also, silly semi-technical point: I have never, ever, had a bad experience using git submodules, but many others have. I like submodules, but often work in teams where otherwise technically good people really hate them due to bad prior experiences.