The electrolyte drinks have the advantage over plain water as they stimulate thirst which keeps you drinking, the sodium in the drink allows fluids to be absorbed faster into the blood and maintain a good fluid balance.
These are fine on their own up to an hour but beyond this you will need an energy drink that offers complex carbohydrates which provide a steady release of energy.
Then there are energy gels and bars, gels usually need to be washed down with water to aid digestion.
There is a huge variety of choice and we are are all different and you need to try things to see what works for you and what your body needs in different situations.
For example, on a 2 hour steady ride with a couple of stiff climbs I would drink one bottle of electrolyte in the first hour, a banana,gel or bar on the hour followed by carbo drink in the 2nd hour with another bar or gel as a reserve in case. But that's not going to work for everyone, and longer rides need more planning,