The Real Question
State management is not a contest of libraries. The right choice depends on how much shared state you have, how often it changes, and how many people need to reason about it.
Zustand
Zustand is small, direct, and easy to adopt. It works well when teams want a lightweight store without reducers, action boilerplate, or a large opinionated ecosystem.
Redux
Redux is heavier, but the structure can be valuable in large applications. Its conventions, tooling, and traceability help when many teams touch the same state transitions.
Decision Rule
Choose Zustand when the state model is simple and local to a product area. Choose Redux when state transitions are complex, shared broadly, and need strong observability.