Aux cable for Iphone first gen

[kokoui]

Hello , i am interested on buying an aux cable in order to connect my iphone with my car's radio. I have found two types of aux cable for iphone, one that is connect straight on the dock port of the iphone to the aux input of the car and one connecting on the headset port of the iphone and on the aux input of the car. What is the difference in performance between those two cables.

Any recommendations?
Thanks for your time

 

[alphaod]

Connection from the dock port is a line-out which is better for the stereo on your car. The headphone jack is amped, so if you use that you may get distortion etc.

Use the dock port connection.

 

[kokoui]

Thanks man , i will follow your advise