The normal one is for high powered endurance activities and contains some carbs (sugar) to help fuel you through them.
They have one with even more carbs, sodium and potassium for people running marathons.
The last two on that chart aren't a good choice for someone who isn't active. Stick to the first two for that.
If you look up the evidence for the downsides of artificial sweeteners anything that finds one is generally an observational study. So for example, the claim that they cause obesity is backed by the observation that obese people consume it in greater amounts than people who are not obese. That's like standing in front of a hospital and noticing everyone with a broken leg is on crutches and coming to the conclusion that crutches are the problem. Double blinded, placebo controlled studies don't find this effect. The best evidence we have indicates they are safer than the obesity that full calorie sweeteners cause in most people.
This is a false choice and has nothing to do with the above commenter's preferences.
Many people just desperately long for convenient foods/drinks that aren't so sweet in the first place and feel frustrated that the largest brands don't want to bother with them.
Sometimes I add a dash of lime
Veeeey low cost and great. And you can pre-mix it in a zip lock bag to have it always available. And add some orange flavour kool-aid powder if you need flavour.
Commercial Rehydration drinks are overpriced and overhyped IMHO