If I wanted to persuade someone who only knows ArcGIS/ESRI products that they should look at QGIS/open-source tools, what particular features should I point to? Aside from being free and open-source - what wow features do they have? What can you do easily that you can't in Arc?
(I don't really know what Arc/ESRI is like these days as I haven't used it for over a decade)
