Which one is better, the sound quality of vinyl records or CDs?

This depends on individual opinions. From the process of music performance to the listener's ears, vinyl records involve less conversion process. Even in the most extreme example, the music played can be directly recorded and then played back, which involves converting sound energy into mechanical kinetic energy, and then converting mechanical kinetic energy into sound energy. The earliest wax cylinder phonograph used this principle. Of course, today's vinyl records go through many more processes than the previous example, and each process may increase distortion. But one thing is that the production of rigorous vinyl records is completely done in analog form, that is to say, it has not been digitized. This is important because humans live in a simulated world, and our senses are completely simulated. Any time you convert an analog signal to digital, some of the information is lost and this is irreversibly lost forever. So why do many people think CDs have better sound quality? This is because vinyl records themselves wear out every time they are played. Moreover, the cartridge is easily affected by static electricity and produces noise. From a practical point of view, the noise floor of vinyl records will therefore be relatively high. In a poor sound system, it is easy to have the illusion that CD is better than vinyl, or at best there is no difference between the two. But when it comes to premium sound systems, the difference between the two is stark, and most people would say vinyl is much better. But whether it's so good that people are willing to pay the price difference depends on each person.