It’s easy to retrieve storage data for SharePoint Online sites with PowerShell, but it’s faster with the Graph. Some disadvantages do exist, but it’s nice to have a choice. TheGraph is faster, especially with large tenants, but the SharePoint Online PowerShell cmdlets can deliver more data.
https://office365itpros.com/2020/05/07/reporting-sharepoint-online-site-usage-data-powershell-graph/
