Events are application facts, and listeners are individual handlers that respond to those facts. A subscriber groups multiple listener methods for related events in one class and registers them together, which is useful when the handlers form one cohesive concern.

Observers are specific to Eloquent model lifecycle events such as creating, updated, or deleted and group those model callbacks in a dedicated class. Use events and listeners for broader application or domain occurrences, observers for model persistence lifecycle behavior, and subscribers when a group of related event handlers belongs together.