I haven't tried any of their other stuff, but Pierre's in Berwyn has tremendous cakes, especially sheet cakes. We drive a good way to pick them up, probably passing up 20 bakeries on the way.

One of their big advantages is that they have very long hours, including Sunday hours. One of my cousins that lives in Berwyn and turned us onto them tells me that bakery goods are an important part of most of her Hispanic friends' weekend social lives. That might be stereotypical, but it is one data point.