Smooth plates are easier to clean than grooved ones, and they may also be better for the health of your food…even though a grooved or waffle plate leaves those delicious grill marks. There is some controversy over whether smooth plates are healthier because there is less surface area for your food to come into contact with. Grooves in the panini grill allow most of the fats to drain off the sandwich before it's cooked so that all you're left with is a juicy, healthy sandwich. So this choice comes down to personal preference--although you might want to consider how easy each one would be for cleaning before making your decision!