Azure Policy and Azure RBAC can both be used to control access and enforce rules for Azure resources. Azure Policy is used to enforce rules at a resource scope during deployment and management, while Azure RBAC controls permissions and access at the subscription or resource group level. Specifically, Azure Policy denies usage of certain resources like IaaS through rules, while Azure RBAC would be used to control who can operate or make changes to Azure Policy through role-based access control. When deciding which to use, consider if you want to enforce rules on resources or control administrative permissions.