Cabling punches a hole through a blockage. Jetting scours the pipe wall back to bare material. For recurring Summerville clogs, that difference is the whole point.
When jetting is the right call
If your kitchen line clogs every few months, you have a grease coating that a cable passes straight through. The same is true of scale build-up in older lines and fine root hair after a mechanical cut. Jetting removes the material rather than making a channel through it, which is why the interval between calls gets longer instead of shorter.
Hard water makes this more relevant here
At 5.5 grains per gallon, mineral scale accumulates inside drain lines alongside grease and soap residue. Summerville kitchen and laundry lines narrow faster than they do on softer coastal supply, and jetting addresses the deposits directly.
When we will say no
Jetting is high pressure, and old cast iron or clay that has already lost wall thickness may not take it. That is exactly what the camera inspection is for. Putting a jetter into a compromised line can turn a blockage into a failure, and we would rather recommend lining or replacement than cause that.