Garden cultivators are lighter pieces of equipment than tillers and are used to loosen the soil in existing areas, weed the area and mix compost into the soil. Garden tillers are more powerful, with heavier, larger tines to work the soil. While tillers can perform smaller jobs in place of a garden cultivator, heavy-duty tillers are best used for larger projects like breaking up new ground or digging deep into the soil. United Rentals has a fleet of walk-behind and hand-held tillers for rent sure to help you complete your next project.