This depends on many things like your cooking purpose and portions since these two appliances work pretty much the same way. These exceptionally powerful tools are always ready to cook meals easily and quickly. But most toaster ovens can save a lot of your cooking time and energy since they can heat up 30% – 50% faster than any regular oven. Along with taking less time for preheating, they can also reduce the overall cook time by 2-4 minutes when cooking small portions of foods.