Best way of input in a car stereo head unit?

Ram

New member
Which way has the best sound quality: iPod connected to AUX, a CD, or a USB drive (connected to a usb port on the deck)
I understand the AUX input can crackle due to the wire itself, but im more worried about the overall sound quality.
 
Usb provides the easiest direct transfer of data, rather than a cord that shorts out and crackles when you move it. USB is much easier.
 
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