The primary differences lie in cost, maintenance, and visibility. Overhead transmission lines are significantly more cost-effective and easier to repair, as problems can be visually inspected and accessed quickly. They are widely used for long-distance transmission and in rural areas due to their economic advantages. underground cable laying is a much more expensive and labor-intensive process, making it better suited for densely populated urban areas where aesthetics and space constraints are a concern. As a manufacturer and exporter, Ningbo Changshi specializes in providing comprehensive one-stop supply for both overhead transmission line (OHTL) equipment and underground cable laying equipment, allowing our clients to choose the best solution for their specific project needs.