Under what condition should you use Flow Designer over Workflow?

Using Flow Designer over Workflow is particularly beneficial when your trigger involves CRUD (Create, Read, Update, Delete) table operations. Flow Designer is designed to handle modern automation needs with a user-friendly interface and a streamlined process. It uses a trigger-and-action model that is well-suited for scenarios that revolve around database operations, offering enhanced performance and real-time processing capabilities.

Flow Designer also enables a more intuitive approach to automation, allowing developers to create flows that can easily respond to database changes. This makes it ideal for scenarios requiring immediate action following data manipulation, which aligns perfectly with CRUD operations.

Although manual intervention, the version of the instance, and the need for a custom user interface are valid considerations, they do not present as definitive a reason for using Flow Designer over Workflow as the direct handling of CRUD operations does. Using Flow Designer for CRUD operations allows for better integration with ServiceNow's capabilities, easier updates, and less complexity in managing automation processes.