To me they are two totally different things. It depends on what you are in the mood for. Tokyo Dining was terrific when we went, but it was definately lighter fare (the sushi was terrific). The service was great, we ate quickly but not rushed, everyone was so polite.
While we have not eaten at TI, I would have to say- based on the menu, you would have to be in the mood for a heavy meal in order to enjoy it to the fullest.