An SRS provides a consistent structured format consisting of a number of separate sections for capturing a wide range of information about your requirements. The strength of an SRS is that the extensively-identified set of topics makes sure important areas are addressed.
Use cases describe step-by-step how an actor interacts with the system, where an actor is usually the user, but could be another system or a piece of hardware. Use cases are a widely used and highly regarded format for capturing requirements. Because of their concrete step-by-step format, they are easy for a variety of stakeholders to understand in essentially the same way.
Use cases vs. SRS for requirements gathering.
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