Totally agree with Toothpickman on his comments, and would only add that there is also some varience depending on the instructor.
Just this past weekend, I completed the PADI Advanced o/w "adventure" dives toward getting my c-card. My experience with the instruction was okay, but I felt some of the book review was a bit rushed.
Before I left for home, I got the chance to chat with another instructor from the same store who teaches the SDI (Scuba Diving International) courses. He explained for me and a recently certified o/w certified diver what the SDI advanced course entailed and the differences between SDI & PADI. The nuts and bolts of it is that the SDI involves a bit more classwork and 2 dives each on the 5 "specialties" that you experience (such as search recovery, navigation, night dive, etc).
From his explanation, his curriculum sounded a bit more thorough than the PADI course I had just completed. And since the reason for the instruction was to increase my knowledge and skill as a diver, I now would have preferred to go through the SDI curriculum. And I am considering asking the shop how we can work this.
So, in a nutshell, Toothpickman is correct, the information taught with the advanced certs range wide and far, so be sure to not only interview the shop, but the instructor as well.