> better support for ML... such as data and model versioning options?

I'm not familiar with the kinds of files ML deals with. But if you want to version control huge data dumps or non-textual files, git is not ideal. Or use it as a general purpose "share folder" to store random things. A git repo is best fit to store source code for a single project.

SVN might be OK if you insist on using 1 source control system for both code and dumps.

But I don't think you need to force all things into 1 system. It would be acceptable to store pure source code in git. And dumps in something else, maybe using old school backup strategies rather than source control if they are truly massive.