Does a piercing hurt more with a needle or an Ear Piercing Gun?

Usually not. Since the method of piercing the body is completely different. Piercing Guns use a spear like or tapered point to drive through the tissue at a high rate of speed. The piercing is caused more by the speed force of the spring action of the device and tend to tear through instead of cut. In some cases the piercing stud doesn't enter the tissue fast enough and the stud's back works like a punch. A piercing needle is a lance point hypodermic need with the hub removed. The same style used by the medical industry. It is surgical sharp aka very sharp like a razor. It slices through the tissue very quickly with little trauma. I think a good way to compare the two is an ear piercing gun is called a gun and the stud is like a bullet. A piercing needle is like a knife or a razor. Ask anyone which hurts more to be shot or to be cut with a sharp knife. Think about it.