I used the giant Kaplan book/CD and the EK Audio Osmosis with Jordon and Jon. They were both great products. They focused on different areas, with Kaplan going into a bit more detail (especially in PS) and J&J bring more useful for tips, methods and keeping older material fresh (especially good VR strategy.)
Overall, I'd say go with both if you can, but otherwise what are you weaker areas? Kaplan was more detailed and had far more mechanical and mathematical information and rather difficult practice tests, while the EK audio course seemed to zero in on conceptual rather than mechanical. Obviously things like optics and titration curves will suffer in an audio lecture, but they really came in handy for going over or reaffirming things I already knew, particularly anatomy.
My suggestion: Use the EK:AO to go over things you already know, and use the Kaplan to learn things you missed the first time through your class.