Well of course our heads are better. Think of it this way. A rotary cutter is as wide as the disk, so say 4' . our heads are 18-20" wide so you can be very precise. Also you have the frame on each end so you can bump against a rock without hitting the rotor. Also you can move smaller rocks out of the way with the frame and cut where needed.
As West said you can close the door and control debri very well. and lastly our finished product top notch.