The only reason I would see to go with Les Cellier, would be to try something new... but, it's not exactly a unique and memorable restaurant. Some people love the Cheese soup, so that might be a reason to go. But as to the steaks, they really aren't anything special. They don't compare to steaks at real off property steak houses.
California Grill does have food and atmosphere superior to Les Cellier.
Of course, if you're looking for something new, you might also try some of the other signature restaurants, probably all of which I'd personally pick over Les Cellier.