Toaster ovens and microwaves generally have different wattages. The microwave uses 1000 watts, and the toaster oven uses 1225 watts. The multi-function microwave is ahead of the toaster oven in energy-efficient cooking as it uses about 20% less power. A microwave oven grill is a relatively small, boxlike oven that raises food temperature by subjecting it to a high-frequency electromagnetic field.