We have done both and FAR prefer Chef Mickey's. Contrary to popular opinion here on the boards, we did not find the food significantly better at PF. The strawberry soup is delicious, but otherwise, we thought we could find just as many (if not more) items we at least liked at CMs. Also, we prefer the Fab 5, the atmosphere, and the napkin dance at CMs on our first night...it is a fabulous way to kick off the vacation. We enjoyed the company of Cinderella, Prince Charming and the Tremaine clan at 1900 PF...the step-mother and sisters were GREAT characters...but we don't think they compare to Mickey himself, and we still love CM more.
PP is right. It will be tough to get CMs if you're planning on it for the trip on your ticker. The reason we ended up trying PF was because we couldn't get CM. Keep trying, something might open up!