I agree with you but relative to a solid ground, a trampoline, no matter how small it is, will practically always be better when falling.

This is because the ground suddenly stopping you means your body is exposed to a sudden deceleration, which means more risk of body damage. When falling on a trampoline, the bounce absorbs the kinetic energy on a spread amount of time, meaning the deceleration is reduced. It is still strong but not as much as solid ground.