Migrating from Amazon ECS to EKS offers several benefits, including greater control and flexibility, portability, and networking capabilities. Companies like Amazon, HSBC, JP Morgan Chase, and Delivery Hero use EKS due to its ability to advance in Kubernetes. Designing applications to run on EKS provides more flexibility, as the abstraction layer helps package containers for quick movement to another platform. EKS also offers open-source solutions, community support, and faster networking capabilities compared to ECS. The migration process involves rewriting Task Definition files to Kubernetes deployment YAMLs, spinning up an environment, configuring CI/CD pipelines, handling networking, running tests, and switching traffic to the new cluster. To make the journey easier, using automation tools like CAST AI can streamline infrastructure complexities and automate cost optimization. Ultimately, choosing EKS provides significantly greater flexibility in controlling underlying resources and taking advantage of Kubernetes' functionality.