How is GIS a clear win for Django, when the largest gis project on earth (OpenStreetMap) runs on rails?
But, to help those wondering about RnR vs Django for dealing with GIS data, the answer is the python ecosystem is just larger for dealing with GIS data. There are more libraries like fiona, shapely, gdal examples, etc. Django ORM supports all of the PostGIS functions, geos and ogr object helpers.
Rails does not have an alternative for PolygonField, Raster support, or geometry field queries like filter(geom__intersects=area)