Ok here is my 2 cents. power rodding is perfect for tree roots and any hard obstructions. A jetter is more for sludge, and grease blockages. Why would you want to rod from the roof? The clean out in the yard is perfect for power rodding both directions. I can see the other guy might have trouble pushing a camera up hill from the clean out back. Oh and here is one other little fact, since you do have tree roots, you need to do maintenance and rod your sewer at least every two years. Our company guarantees main line roddings fro two years and tells home owners that it should be rodded every two years as preventive maintenance. Roots do grow back and need to be cut, just like grass grows back and needs to be cut every two weeks.
After the power rodding start using Root-x once a year, it does work. I had a homeowner that had to have the rodding done every two years like clock work. We started her on Root-X, its been 5 years now and counting. We just show up once a year to retreat her sewer on the third year we ran the camera down the sewer and seen that the root growth has stopped.