For our MultipliCity tool, I'm adding outlines of cities as system boundaries. I get the city outlines by taking the relation ID from openstreetmap and use the great "Convert Open Street Map relation to GeoJSON" tool to get the polygon as GeoJSON. For some relation IDs this tool gives me several available polygons.
My question is, which polygon should I use? Does it matter and if so, in which way?
Here is an example to better illustrate: In the case of Paris (relation ID 7444, https://www.openstreetmap.org/relation/7444), I get 4 polygons, with different params, timestamps, NPoints and length, see here: http://polygons.openstreetmap.fr/index.py?id=7444

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