Vastly different use cases.

Publish a module as a wheel if you want to be able to use pip to install it in your servers, or anywhere really.

Once you've built out your virtual environment you can build your docker image and push it to a registry.

Your helm chart should include references to docker images that are getting deployed to a kubernetes cluster, among other entities that need to be built out for your app to work.

Those are all different layers of the deployment, independent of each other.

If someone prefers 1 over 2 (or viceversa), they don't understand what they think they know.