As an individual racer you can test your own strength and technique, as you have no one to help you trough the obstacles. You are independent of other racers and can compete for the best possible time. Is there an obstacle you can not handle, then there will be a penalty round adjacent to the obstacle. Typically consisting of 200 meter extra running.
Participants racing as a team has the opportunity to help each other on the course, and have an amazing experience of teamwork and community. When You register as a team, You either have to create a teamname (first registration) or join an already existing team (following registrations).