PostgresML is available as a fully managed database service, that includes the storage, backups, metrics, and scalability through PgCat that large ML deployments need. End-to-end machine learning is rarely just about running the models, and often more about scaling the data pipelines and managing the data infrastructure around them, so in this case PostgresML also provides a large service advantage, whereas with MindsDB, you'll still need to figure out your cloud data storage solution independently.