If your car has rare spare parts, and is not a common model, you will be safer going to a dealership. They might be more expensive but you are assured of getting a mechanic that has been trained by a particular car manufacturer. Some dealerships are so good that they have a mechanic from each of the major manufacturers. You will get a mechanic particular to your car type who will probably install factory parts instead of used, tried parts. A dealership is ideal if your car is still covered under warranty or the costs are paid by insurance.