Cloud AD also works seamlessly with on-prem AD, allowing things like online, self-service password reset for the domain, and in the reverse direction to use TPM-backed certificates/WebAuthn for securing web apps or anything behind MS-linked SSO. Of course, it also integrates tightly with Azure, so you can do RBAC for any VM/service in Azure, since they automatically get service identities in your AD.
That level of integration is so far above anything else on the market that it isn't even a discussion.