You will cut down on brake squeal. When changing brake pads, resurfacing the rotor is recommended. Rotors cans only be turned so much and have a minimum thickness stamped right into the rotor. Once this thickness is reached the rotor must be replaced. Drum type brakes, which have been around forever, are not much more complicated than disc brakes if you pay attention to what you're doing.
Drum brakes have a primary shoe which goes to the rear and a secondary shoe which goes to the front.
The biggest problem with drum brakes is keeping them adjusted properly. As with disc brake rotors, whenever you replace the brake shoes, the drum should be resurfaced. Now for a couple of pointers on hydraulic brakes. If you come to a stop and the brake pedal slowly drops to the floor as you hold it, you will need to replace the master cylinder. If you have a hard time getting going and the car pulls to one side, you may have a bad caliper or a restricted brake hose to the caliper.