I cannot really tell the difference between the electrolyte tablets because they all seem to work the same for me, but I always take them during my Bikram yoga classes or whenever I feel dehydrated due to excessive sweating to the hot weather.
I particularly like this one because the tablets are thicker than other brands so you only need one rather than two and it is also sold at my Bikram yoga studio. However, being in Australia, it costs triple to buy a tube of electrolyte tablets so I'm ecstatic that iherb stocks this.
This does the trick to keep me hydrated and the flavour tastes great too!