What tool would you use to ensure all file shares, security, and settings are migrated correctly?

The Storage Migration Service is specifically designed to facilitate the transfer of file shares, along with their associated security settings and configurations. By using this service, you can streamline the migration process, ensuring that not only the data is moved but also that security permissions and access settings are preserved and migrated correctly. This is crucial for maintaining business operations without disruption, as it helps avoid potential issues related to file access or security post-migration.

RoboCopy, while a robust tool for copying files and directories, does not inherently manage the migration of security settings or file shares as a cohesive service. Azure Data Factory serves a different purpose primarily focused on data integration and transformation, and the Microsoft Sync Framework is intended for synchronization scenarios rather than dedicated migrations.