AutoZone seems to carry more parts then Advance they also seem to have better prices. I usually call both to see how much parts are then make my decision. Although Discount is close to my house, on my way home from work I pass AutoZone so thats usually when I stop. I have a 50/50 chance getting the right part at Advance... most of the time I get the wrong part. Their system says this is the part number, they sell me that part and its not near as close as the one I pull off the car. In those cases I need to take my cellphone out take a picture of both parts and show them it does not work.