I prefer Le Celier, though I'm a pretty picky eater. I've eaten at Jiko twice and did enjoy it both times, but I love Le Celier's pretzel breadsticks. I could eat those all the time. I'm sad they got rid of the chocolate whiskey cake...
Still, my family only goes for about four days and we don't have time to visit other resorts besides the one we're staying at, Le Celier is always the easier place to eat since we're already in Epcot already.