This is a no-brainer. Give me the low volume shoulderless road any day. The high volume road will be noisy, have more billboards and other scenery blocking signs, and the shoulder will be full of tire treads, glass, construction materials, and even discarded clothing. The only good thing about the high volume road is that if you keep your eyes open, you'll find a good hand tool on the shoulder looking for an owner who will take care of it.