I'm a big fan of OpenShot. I can hardly wait for the first stable release of it. It shows a lot of promise as far as effects and ease of use.
Both are built on different philosophy which in the end, mould users to certain personalities, for example, Open Source users tend to share knowledge because they depend on it for their survival thus tend to be friendlier and always willing to share, even among strangers where the most probably reason they do not is only because they do not know the answer.
This is most obvious when customized modules are built on Open Source and sharing it does not impose any cost to the new user whereas the same cannot be said of Close Source modules. The most popular Close Source GIS is arguably ESRI's ArcGIS as they have a 20 year start. The file extension of this proprietary software known as ".