[libraries] Main Subject vs Depicts

Hello Wiki-GLAM community, A small group at Western Libraries is working to pilot a bulk upload of archival images to Wikimedia and associated Wikidata. We are wondering what property would be better suited to describe the Fond and Series level descriptions we are creating in Wikidata - Main Subject (P921) or Depicts (P180). Here is an example of a series description using main subject https://www.wikidata.org/wiki/Q109363562 Any thoughts? Erin Johnson, MLIS Acting Head, Discovery, Description & Metadata (DDM) Metadata Management Librarian Western Libraries, Western University London, ON I acknowledge that Western University is situated on the traditional lands of the Anishinaabek, Haudenosaunee, Lūnaapéewak, and Attawandaron peoples. These lands are connected with the London Township and Sombra Treaties of 1796 and the Dish with One Spoon Covenant Wampum. I respect the work of land defenders and water protectors as contemporary stewards of the land and support their vital contributions to the Earth and our society.