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You can now review the differences across the comparison table below.

Chain of Responsibilitybehavioral
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Flyweightstructural
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Observerbehavioral
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Criteria	behavioralChain of ResponsibilityView pattern	structuralFlyweightView pattern	behavioralObserverView pattern
Basics
Category	behavioral	structural	behavioral
Summary	Pass a request through a sequence of handlers until one handles it or the chain ends.	—	—
Intent	Pass requests along a chain of handlers until one of them handles the request or the request reaches the end of the chain.	Use sharing to support large numbers of fine-grained objects efficiently by separating shared intrinsic state from per-object extrinsic state.	Define a subscription mechanism so multiple observers can react to subject events without the subject knowing concrete subscriber details.
Decision factors
Problem	A request must pass through multiple possible handlers, but the sender should not need to know which handler will process it.	A system creates a large number of similar objects, but storing all of their state separately uses too much memory.	A system needs to notify multiple dependent objects when state changes occur, but hardcoding those dependencies makes the design rigid and tightly coupled.
Tradeoffs	Requests can become harder to trace because control flows through multiple handlers. A long chain may add overhead if many handlers are checked on every request. It keeps handler logic isolated and easier to extend.	Adds complexity because state must be split into shared and unshared parts Can be harder to understand when many objects depend on an external context	Notification flows can become hard to trace when many observers react to the same event Observers may receive updates they do not need unless subscriptions are carefully designed
Practical fit
Languages	typescript java python angular react react-native csharp dotnet	typescript java python angular react react-native csharp dotnet	typescript java python angular react react-native csharp dotnet
Platforms	frontend backend integration	Web Backend Mobile UI kits Cross-platform systems	Web Backend Event-driven systems
Integration notes	Chain of Responsibility is useful for validation pipelines, support routing, approval flows, and any system where requests may be processed by different handlers in sequence.	Flyweight is useful when thousands or millions of similar objects need to be represented efficiently, such as trees, glyphs, tiles, or UI tokens.	Observers work well inside a single application boundary for UI events, domain events, and in-process notifications where subscribers change dynamically.