 The decision of which to use is based on a number of factors, such as whether the company operates in a highly regulated sector, such as the pharmaceuticals industry that must comply with rules regarding the control and security of data, or if the business must bring services to market quickly, such as a web applications developer.The first would opt for a private cloud for security peace of mind, while the web developer would choose a public cloud offering.Most companies would operate a mixture the two, also known as hybrid cloud delivery.