1, BMW and Mercedes-Benz have good car-making technology, and both adopt top German technology to ensure the perfect unification of parts. Audi's manufacturing technology is not excellent internationally, and its product quality is slightly lower than that of BMW and Mercedes-Benz.

2. The quality control of BMW Benz is better than that of Audi vehicles. BMW Mercedes-Benz has to undergo tens of thousands of quality tests before leaving the factory. The quality of the whole vehicle is stable and the accident rate is extremely low. Audi's vehicles have also been strictly controlled, but the overall quality is not as good as that of BMW Benz, so compared with Audi and BMW Benz, the quality of BMW Benz is still good.