I'm building a web interface with two panels. On the right one there would be a map, on the left one there would be some places, similar to Google Maps. We are considering having the scrollbar of the left panel on the left. The reason we find is that it doesn't visually block / separate place from map.
However most of Desktop Programs have this kind of scrollbar on the right (Pages, Keynote, Spotify) and most webpages too (Google Maps). I'm sure they have done many User Experience tests, but I would love to know more about why is better to have the scrollbar on the right on this case.
What do you think?