I like Rockauto. I use it to find parts.
If I want to be entertained, I go to a place that entertains me.
I think that the Rockauto site may be targeted more for less frequent internet users. I'm a beer drinkin', deer killin' mechanic. I want to identify and order a part as quickly as possible, not waste hours trying to find a part.
And while I personally do drink beer, both Bambi and Faline are safe from me.