With none - you do realize that they are jacked with stims, which is how they work? You can instead just take some coffee, and get roughly the same effects, since most of them have caffeine as their primary ingredient.
However, if the choice is between the two, preworkouts are better, since these energy drinks are usually full of sugars, which is not good for anyone's diet.
Personally, I would tell you that a good meal an hour before working out is the best preworkout you will ever find.