Single vs. multiple IIIF collection

multi_coll.json

{
  "@context": "http://iiif.io/api/presentation/2/context.json",
  "@id": "http://iiif.example.edu/static/iiif_prezi/5799e11d-2e00-439c-a824-fb006fbe7b99.json",
  "@type": "sc:Collection",
  "label": "Christo and Jeanne-Claude's family, unidentified location, 1963",
  "collections": [
    {
      "@id": "http://iiif.example.edu/static/iiif_prezi/672a852a-f597-445b-82d9-0890e1b96568.json",
      "@type": "sc:Collection",
      "label": "07568"
    },
    {
      "@id": "http://iiif.example.edu/static/iiif_prezi/57843ae9-993d-447a-a50b-473bc00aecf3.json",
      "@type": "sc:Collection",
      "label": "07573"
    },
    {
      "@id": "http://iiif.example.edu/static/iiif_prezi/3dd6dd14-b89b-443d-9370-a0743396f86b.json",
      "@type": "sc:Collection",
      "label": "07575"
    },
    {
      "@id": "http://iiif.example.edu/static/iiif_prezi/41e3a949-583c-4394-8447-ad019aaced3f.json",
      "@type": "sc:Collection",
      "label": "07576"
    },
    {
      "@id": "http://iiif.example.edu/static/iiif_prezi/ec88e2f7-cee5-41c6-a4d7-2aaf868ccef9.json",
      "@type": "sc:Collection",
      "label": "07577"
    }
  ]
}

single_coll.json

{
  "@context": "http://iiif.io/api/presentation/2/context.json",
  "@id": "http://iiif.example.edu/static/iiif_prezi/924cca4b-b606-4ff1-a9fc-7ca152458bd3.json",
  "@type": "sc:Collection",
  "label": "REP173147-1",
  "collections": [
    {
      "@id": "http://iiif.example.edu/static/iiif_prezi/5799e11d-2e00-439c-a824-fb006fbe7b99.json",
      "@type": "sc:Collection",
      "label": "Christo and Jeanne-Claude's family, unidentified location, 1963"
    }
  ]
}