Vegetable and Canola Oil are relatively interchangeable because they have almost no flavor/aroma and have a high smoking point. Peanut Oil however can change the flavor of the food a bit, as will Olive Oil. Costwise, it's also makes sense to go with a cheaper oil such as Canola or Vegetable since you'll be using such a large quantity of it.
"Boldness has genius, power, and magic in it."
Johann Wolfgang Von Goethe