In a car environment, it is doubtful you can truly tell the difference between USB/AUX and Bluetooth. I have done A/B tests in the Volt and couldn't tell the difference myself using the BTC450 bluetooth on Amazon.
Gen 1 can play audio directly from any iOS device via USB. Anything else you will need to use AUX port. Gen 1 Bluetooth do NOT support stereo streaming, mono voice calls only.
Gen 1 can play audio directly from any iOS device via USB. Anything else you will need to use AUX port. Gen 1 Bluetooth do NOT support stereo streaming, mono voice calls only.