Pega offers a clear parent-child case relationship that's easily created and maintained. Dependencies can be configured, where reaching a specific stage in a parent case automatically triggers a child task in a child case, while the parent case remains on hold until a certain condition is met before moving forward.
This configuration allows multiple users to work on cases in parallel. Many of these settings are readily available within Pega case settings.
Overall, Pega's case management is unparalleled compared to other options.