The most prominent substances in energy drinks are sugar and caffeine of which the intent is to give an energy boost and not to hydrate at all. Furthermore, caffeine is a typical diuretic because of the hindering of the antidiuretic hormone that causes increased urine production. Once the effect of the energy boost wears off, you are likely to feel fatigued, drained, and most likely dehydrated.
SOS on the other hand is a truly natural product that provides a rapid yet healthy boost of water. Appropriate hydration is vital for optimal performance and typical lifestyle endurance.