StatefulSet or Deployment for Jira on Kubernetes
Deployments are primarily based on stateless services, where data is externalized to be stored on some other storage block or database. Using deployments for stateful services is not recommended as you will encounter scaling problems, since multiple replicas will read from the same persistent volume. 

Instead, StatefulSets are the best approach to stateful services. Each replica of the StatefulSet has its own state mounted on a dedicated persistent volume, thus scaling a StatefulSet will create a new persistent volume and attach the new replica to it.