The guys I deal with at my local napa are all old school, so to me if it's just a few dollars difference it is worth it because they get me what I need ASAP. Napa's parts line is mostly very good quality from what I have experienced. It's nice being able to walk in and walk out. I try to avoid the advanced auto, and only go there if I need a part when napa is closed.
I think it's regional