In a team you also have the ability to delegate your calendar to other team members (e.g. if you are on holiday, or if your secretary or back office needs easy access to your calendar) and get access to a powerful feature called "Free-Busy" which allows easy scheduling of meetings, without doing annoying round-trips - your calendar application will automatically be able to figure out times for meetings where everybody is available.
Some info for further reading:
- The team permission system: http://blog.fruux.com/2014/07/11/team-management/
- General info about the team product (including delegation and free-busy): http://blog.fruux.com/2013/01/04/fruux-for-teams/
- Calendar feeds and subscriptions: http://blog.fruux.com/2014/10/02/public-calendars/
- How scheduling works: http://blog.fruux.com/2014/09/26/caldav-scheduling/