Okay, so it allows to run the same image, but is not CLI-compatible with docker that's what you mean? But is it more / less / equivalently efficient ?

Docker Desktop/Obstack start a single VM that runs all your containers. This means that you'll have to scale it accordingly. Davit uses Apple Containers that runs a very thin VM for each container you spin up. Depending on your use case it's more, less or equivalently effcient.