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Helm is the correct choice for defining application services in Kubernetes using YAML configuration files. It is a package manager for Kubernetes that simplifies application deployment and management. With Helm, you can define, install, and manage applications through Helm charts, which are collections of YAML configuration files that describe the resources needed for your applications.

Helm provides a templating mechanism that allows you to customize your deployments easily, making it particularly useful for managing complex applications with many configurations. By encapsulating the configuration files and resources into a chart, users can deploy applications with a single command, significantly enhancing efficiency and consistency.

While kubectl is a powerful command-line tool mainly used for managing Kubernetes clusters and their resources, it does not package applications or provide templating out of the box. Docker CLI, on the other hand, is focused on managing Docker images and containers, not specific to Kubernetes configurations. Kustomize is another tool for managing YAML files in Kubernetes, but it does not provide the rich packaging and templating features that Helm offers, which is why Helm is the preferred choice for defining application services in this context.