Newb,
didn't see you last question until after I already posted. If you can afford it, get both. They both have great uses when covering. Ask your instructor, or other flyers, and see if you can get a used iron or heat gun from them. great way to save money. Heck, the first plane that I covered I used a small travel (clothes) iron to cover it with, and my trainer still has the same covering on it too!