AlloyDB Omni is a PostgreSQL-compatible database that offers high compatibility with open-source PostgreSQL and provides additional features such as AI/ML workload integration, columnar data processing, and optimized memory management. Unlike other PostgreSQL-compatible databases, AlloyDB Omni's architecture is architecturally similar to PostgreSQL, providing the least vendor lock-in. However, its closed-source nature means that end-users have limited transparency into its internal workings. Aiven for AlloyDB Omni provides a managed solution for AlloyDB Omni, while Aiven for PostgreSQL offers more flexibility and data portability as an open-source solution. The choice between the two ultimately depends on the intended use case and requirements, such as AI/ML integration or traditional relational data storage.