The spiral-wound structural walls of B-type and A-type pipes mainly differ as follows:

1. Structural Design: B-type pipes typically feature a double-walled hollow structure, offering greater hoop stiffness and resistance to external pressure; A-type pipes have a relatively simpler structure.

2. Performance Features: Type B pipe excels under higher external loads and soil pressures, demonstrating stronger resistance to deformation; whereas Type A pipe meets requirements under normal conditions but performs slightly worse than Type B pipe in complex environments.

3. Application Scenarios: Due to the superior performance of Type B pipe, it is commonly used in situations with high requirements for pipeline performance, such as deep burial areas and regions with heavy traffic flow; Type A pipe is more suitable for general drainage projects.

4. Cost-wise: Generally speaking, the production cost of B-type tubes is relatively higher, thus the price is also higher than that of A-type tubes.

In summary, the choice between Type B pipe and Type A pipe should be based on a comprehensive consideration of specific engineering requirements, budget, and usage environment, among other factors.