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

Criteria	structuralFlyweightView pattern	behavioralMementoView pattern
Basics
Category	structural	behavioral
Summary	—	—
Intent	Use sharing to support large numbers of fine-grained objects efficiently by separating shared intrinsic state from per-object extrinsic state.	Capture and externalize an object's state so it can be restored to a previous point in time.
Decision factors
Problem	A system creates a large number of similar objects, but storing all of their state separately uses too much memory.	An object's internal state must be saved and restored later without exposing its implementation details.
Tradeoffs	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	Snapshots can consume memory if many states are stored. Care must be taken to keep mementos immutable and hidden from outside code.
Practical fit
Languages	typescript java python angular react react-native csharp dotnet	typescript java python angular react react-native csharp dotnet
Platforms	Web Backend Mobile UI kits Cross-platform systems	Web Backend Mobile UI kits Cross-platform systems
Integration notes	Flyweight is useful when thousands or millions of similar objects need to be represented efficiently, such as trees, glyphs, tiles, or UI tokens.	Memento is useful for undo/redo, checkpoints, draft recovery, and any workflow where state history matters.