I've tried to give OneDrive a chance several times but no more. Dropbox has been only reliable choice for three-four way sync for me.
“Microsoft 365 Family $99.99/year
Best value: Save 16% with annual subscription
Perfect for up to 6 people Up to 6 TB of cloud storage, that's 1 TB per person Premium safety features in mobile app”
SharePoint syncs via OneDrive, but offers better categorisation and integration with Windows Explorer and Office (“sites”).
I don’t think that the family plans offer tenant management.
Since the only way that DropBox makes sense as anything more than a “lifestyle business” is by focusing on the enterprise. The correct comparison would be what they both offer enterprise customers and not my comparison is on the personal side.