Attachments / File Storage
Adding to Warren's response - also consider where the files need to accessed e.g. where the user needs the file does the user have access to SharePoint or do you need to build additional interface/integration - it is less an issue if using the standard SharePoint integration, but have seen where the url to the file after it is moved to SharePoint is written back to a dataverse record so the user can click the link to get to the file.