Tight-wound structural wall B-type pipes and A-type pipes mainly differ as follows:

1. Structural Design: B-type pipes generally feature a double-walled hollow structure, offering enhanced hoop stiffness and resistance to external pressure; the structure of A-type pipes is relatively simpler.

2. Performance Features: Type B pipe excels under greater external loads and soil pressures, demonstrating stronger resistance to deformation; whereas Type A pipe meets requirements under normal conditions, its performance is slightly inferior to 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 deeply buried 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 pipes is relatively higher, thus the price is also higher than that of A-type pipes.

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