Selection by use case of SaaS, PaaS, or IaaS
Each model that we reviewed, including the on-premises model, has advantages and disadvantages. The one you should choose depends on your specific business requirements, what features are needed, and the developers and testers that comprise your team. You might need a fully out-of-the-box solution and time to market might be a more important consideration than price. Or perhaps you have regulatory constraints that force you to have complete control of the environment. AWS offers a lot of assurances regarding their Service-Level Agreements (SLAs), as well as compliance certifications. The more levels in the stack you decide to manage, most likely the more effort you will have to exert to verify that your systems are compliant with the different regulations.
In general, one good rule of thumb is to let AWS take over the management of your resources whenever possible, and you only take over the responsibility whenever it is necessary. As...