The funny thing about this question is that it doesn’t really matter, unless it does: Sugar harms your health in a whole host of well documented ways, but a little of it, infrequently, is fine. Aspartame has always been under a cloud of doubt, but is probably also just fine in small amounts.

So really, you only need to be thinking about this if you’re having either of them as a regular part of your diet. And if that’s the case, well, this is the part where you really should listen to all those people who recommend that you acquire a taste for water.