I really thought that Josh would take this after seeing the dishes and plating, but Christine wins the title!
She stuck with home-style Vietnamese flavors, and had a very cohesive menu throughout - an appetizer of a cold "vegetable noodle" salad with crab on top and a fish sauce vinaigrette, a braised pork belly on rice with a quail egg on top, and a coconut-lime sorbet with ginger tuile. I thought it looked very simple overall, and that was noted by Gordon, Graham, and Joe. But Gordon also noted that everything went well together when served as a complete 3-course meal.
Josh's plating was fabulous. His lobster and grits appetizer with spicy sweet potato puree was impressive, but the lobster was undercooked, not as butter poached as they would have liked. His rack of lamb was beautifully done - and as Joe noted, he hit all 4 seasons - spring lamb, summer peas, autumn carrots, and winter parsnips. His dessert of bacon pecan pie with vanilla cinnamon ice cream disappointed on the pecan pie side, but all three of them loved the ice cream. It definitely sounds good!
But overall, it sounds like Christine's cohesiveness with her three plates won the day for her. Regardless, I think both will do well.