Redis is the better choice for session storage in most applications. Redis delivers sub-millisecond read and write latency, built-in TTL-based session expiry, and minimal operational overhead for session data patterns. DynamoDB is preferable when AWS-native infrastructure without a separate cache layer is required, or when session data volumes exceed single-node Redis capacity. For most web applications, Redis with automatic TTL expiry provides simpler, faster session management than DynamoDB.
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