We enjoy the food better at CP. Lots of variety and it's well prepared, and the salad bar is great.
1900 Park Fare is good, but we don't eat there often. On this last trip we had lots of "repeat" dishes at dinner, like a couple of different pasta entrees on different sections of the buffet, and chicken dark meat prepared both as "marsala" and "coq au vin" at different stations, basically the same dish, same mushrooms, different sauce.
We thought Park Fare was just a notch above OK, but we love the variety and food at CP. The salmon there is great, so is the Mediteranean chicken, fire roasted corn spoon bread, and asiago cheese sauce pasta. And lots of cold salad choices, I could make a meal just from those.
Also more room to get around the buffet and easier to get back to your table at CP. The way the buffet is laid out at Park Fare caused some traffic jams, and lots of tables to weave between depending on where you are sitting. CP also has lots of tables too, and I think it's bigger than Park Fare, but we find navagating there to be easier.