AWS Shield vs AlienVault: What are the differences?

Developers describe AWS Shield as "Managed DDoS Protection". AWS Shield is a managed Distributed Denial of Service (DDoS) protection service that safeguards web applications running on AWS. AWS Shield provides always-on detection and automatic inline mitigations that minimize application downtime and latency, so there is no need to engage AWS Support to benefit from DDoS protection. On the other hand, AlienVault is detailed as "Provider of unified security management & community-powered threat intelligence required to detect and act on today’s advanced threats". It has unified the security products, intelligence and community essential for mid-size businesses to defend against today’s modern threats.

AWS Shield and AlienVault can be categorized as "Security" tools.