I actually changed my reservation today from dinner to lunch for LTT. We originally wanted to do the dinner because we thought a traditional turkey dinner would be a great way to celebrate Christmas, but then we thought, "To heck with tradition; we like the offerings on the lunch menu better!"
I also think the lunch menu has been recently updated with some new selections, but like khcruise said, lunch is off a menu and dinner is a set, family style meal. I've also heard really great things about their lunch menu.