IaaS, or Infrastructure as a Service, is a model of cloud computing in which providers offer compute resources, storage, and networking capacity to customers over the internet. Customers can access and use these resources, typically on a pay-as-you-go basis, to deploy and run applications. PaaS, or Platform as a Service, is a model of cloud computing in which providers offer a platform with programming languages and tools, data storage, and other services to customers who can create and run applications on the platform. Saas, or Software as a Service, is a model of cloud computing in which providers offer software applications to customers over the internet. Customers can access and use these applications, typically on a pay-as-you-go basis, to deploy and run their businesses.
There is no definitive answer, as the best choice for a business depends on its specific needs and preferences. IaaS is well-suited for businesses that want more control over their infrastructure, while Paas is better for companies that want to focus on their applications and services. Saas is generally the best option for businesses that want to outsource all or most of their IT functions.