Indoor/outdoor skydiving is a ‘skydiving simulator’. That means it gives you an experience as close as possible to real skydiving. The body responds to the air in the same way as it does when you jump from an airplane, where you can use your arms and legs to turn and move around.
On the other hand, you do not experience a true fall. Resistance to the airflow that is able to hold you above the ground is subject to a certain amount of body effort. Indoor skydiving is great fun, but it is cannot substitute the amazing views, which you can admire during skydiving. At the same time, people who are afraid of heights would rather enjoy flying in a controlled environment.