A custom Android operating system provides superior support for hardware and peripherals, eliminating bloatware risks and improving performance and battery life. It also offers enhanced security features, including control over user access to hardware components and protection against malicious code execution. Additionally, a custom OS can be tailored to specific use cases, such as retail kiosks or industrial devices, with improved support for vertical hardware and peripherals. However, creating or using a custom Android OS requires careful consideration of device compatibility, security risks, and the potential need for relocking the bootloader after flashing the custom OS.