AzCopy is the most suitable tool for this scenario as it supports command-line scripting and can resume interrupted file transfers, making it ideal for automated, large-scale data transfers to Azure. Azure Storage Explorer is a graphical tool that can assist in file transfers, but it does not natively support automation or resuming interrupted transfers. Azure File Sync synchronizes files but is primarily intended for synchronizing file servers to Azure Files, not for direct transfers to Blob Storage.