Sci Fi Dine In - because if we could only do one, it would be for the theming, not the food. We can get great food when we're not at WDW, but we can't get theming like Sci Fi anywhere else!
My DH must do Teppanyaki each trip
I would choose Le Cellier if I only had one choice, but I have never been to California Grille, so that might make a difference.