Data Loss Prevention (DLP) is adept at identifying personally identifiable information (PII), while Data Catalog is specifically designed for assigning and storing metadata tags to objects. Although Compute Engine could be utilized with custom applications, it is not a managed service. Cloud Firestore, being a document database, could serve for storage, but Data Catalog is more suited for this particular use case. For more details, refer to Google Cloud DLP and Google Data Catalog.