The text provides an in-depth comparison of three declarative GitOps tools: ArgoCD, FluxCD, and Jenkins X, focusing on their core features, setup processes, and usability in continuous integration/continuous delivery (CI/CD) for Kubernetes. ArgoCD is highlighted for its user-friendly interface and robust documentation, while FluxCD is noted for its growing popularity and multi-tenancy support. Jenkins X, although less popular due to its complex setup, integrates well with Kubernetes environments using Tekton pipelines. All three tools offer unique advantages such as automatic deployments, resource management, and multi-cluster deployment capabilities. However, the choice between them depends on specific user needs, such as the requirement for a user interface or CNCF integration. The text concludes that both CI and CD are essential for effective application deployment, suggesting that users might need to select tools based on their specific requirements for automation, notifications, and rollback capabilities.