Obviously the mechanic, the mechanic is paid by the hour, There is no incentive to work fast, the doctor can't always spend time with the patient. One key difference for me is that doctors are responsible for care at all hours of the day and night. If your doctor doesn't see you when you need him/her you can die and bad things can happen. If your mechanic doesn't see you, perhaps something bad can/will happen, but you can always get another mechanic or if you get in trouble another forklift will be RENTED to you.