IaaS provides the highest level of control over the operating system and middleware, requiring the customer to manage these components, while Azure manages the physical infrastructure. This model is ideal for scenarios requiring specific OS or middleware configurations to meet regulatory compliance.

PaaS offers a managed environment for application development, with Azure taking care of the infrastructure and platform. This allows the company to focus on developing applications and managing data, significantly reducing operational overhead, though it may limit customization of the underlying platform.

SaaS delivers fully managed software applications, with Azure handling all aspects from infrastructure to application. This model minimizes operational overhead the most but offers no control over the application's infrastructure or platform, which might not be suitable for applications needing specific compliance configurations.

All three service models (IaaS, PaaS, SaaS) provide identical levels of control and management responsibilities, differing only in the services they offer. The selection among them should be based purely on the company's preference for service type, without considering compliance or operational overhead.

None of the above accurately describe the distinctions between IaaS, PaaS, and SaaS in the context of the shared responsibility model and the company's objectives.