24 bit instead of 16 bit will give you more digital headroom to play with. AKM make excellent chipsets used in many devices. Clocking is critical for any converter but this has been a well known concern for over 10 years....so most modern well built devices with good power supplies should perform well.
Personally. I'd go for device features first (inputs/ouputs/formats etc.) rather than buy a device based only on the ADC.
Personally. I'd go for device features first (inputs/ouputs/formats etc.) rather than buy a device based only on the ADC.