We love Le Cellier, and always go there when we are at WDW.
We just returned from our trip a few days ago and we did dine at both places. They were both excellent! I have always had great food and service at Le Cellier. CR is another story though. The last two times we went there, it was just so-so. We do enjoy the tanks, but the food and service was not the greatest....that is up until this time. We had a wonderful time! The food was very good, and we had a great server. I ordered the Ahi Tuna, which is new on the menu, and is was out of this world! We really had a nice time at both places.
One difference is that CR can get VERY VERY loud. Each time we have dined there it was LOUD! Le Cellier on the other hand, was not loud at all.