Why is SQL considered more reliable than MongoDB for transactional data?

SQL is perceived as more reliable in transaction data because SQL uses ACID principles, which ensure the integrity of the data in case the system fails. Relational databases support complex transactions with robust rollback and commit mechanisms that are crucial in financial or sensitive operations. The structured schema in SQL enforces consistency in data and avoids anomalies. MongoDB, while this solution supports flexibility, the eventual consistency model will allow temporary inconsistencies in data, making it less than ideal for applications that require transactional durability. SQL has proven stability, so it remains the choice of preference for such use cases.