One thing to note about Content Staging is that it needs an accessible URL to send requests to, as it is HTTP based, whereas CI only needs a connection to the database.
My team is small and we use a shared local database (instead of each developer having their own database). For larger teams this isn't recommended, but for smaller teams it is an option.
We setup a "Local" instance of the CMS administration application on a server which is connected to the shared local database. This allows our team to synchronize content from Production/Staging/Test environments back to our local machines after the site has gone live. This isn't possible with the CI tool.