What is the difference between Docker Desktop and Rancher Desktop?

The difference between Docker Desktop and Rancher Desktop, especially to what extend Rancher Desktop uses docker features, plugins etc, is not trivial.

E.g. the Docker Scout CLI plugin comes pre-installed with Docker Desktop. But for Rancher Desktop it must be manually installed.

• Does Rancher Desktop uses the same Docker Engine: Docker Server, Docker CLI and Rest API as Docker Desktop?
• Why I can not use some docker commands, such as docker init,docker debug with Rancher Desktop? (It is not available as plugin.)

P.S. General differences of Docker Desktop and Rancher Desktop explained in this article are clear.