If your company already runs deeply on Microsoft 365, Outlook, Teams, OneDrive, SharePoint, there is sometimes a case for housing the Business Playbook in SharePoint. The integration is native, the licence is already paid, and IT already knows how to govern it. That's the upside.
The downside is real: SharePoint is a content management system, not a Playbook platform. It will hold your SOPs the same way a filing cabinet will hold them, accessible, but not engaging. There's no built-in onboarding sequence, no progress tracking, no mobile-first SOP card. You'll spend more time on information architecture and less time on actual operations.
The pattern we see work: SharePoint as the document-of-record (legal contracts, compliance binders, signed policy attestations), with Trainual or Whale as the daily Playbook the team actually uses. Two systems, but each doing what it's good at.