The difference between ground-mounted and carport solar solutions is that carports are taller in order to make space for a car to park. The advantage of solar carports is that you will not need additional land the way ground-mount does since the structure is already there. The result is that solar carports provide efficient use of space.
Solar carports also provide vehicles with partial protection from the weather. No parking spaces have to be eliminated or made smaller/bigger to achieve this solution.
Additionally, the system can be used to reduce or eliminate grid-tied electric costs.