Prefab garages can be as good as stick-built ones. It depends on the quality of the construction, its material, and how much care and maintenance you provide. Prefabs are pretty fast to put together, but they are prone to some moisture problems. Many homeowners and pros consider stick-built garages more attractive than other types, as they're custom-built and easier to match to the rest of the property and the neighborhood, but they require regular maintenance and sealing.