Dual op amp and single op amp have their advantages and disadvantages. Dual op amps have higher gain and lower distortion and are suitable for applications that require higher accuracy and lower noise, such as audio amplifiers and measuring instruments.
However, the cost and power consumption of dual amPs are higher and take up more space.
Single-op amps are simpler, cheaper, and space-saving, suitable for simple applications such as signal conditioning and voltage following. The choice of dual or single op amp should be based on the specific application requirements, cost and performance requirements.
Single op amp if the audio channel isolation is the best, if the comparator such as this, double op amp pcb design is much simpler, different use design selection is not the same!