Ok, I'm curious. What is the difference between Pepsi Max and Pepsi Light?

They both contain no sugar.

They both have caffeine

The are both Pepsi products.

So what's the difference?

The difference between Pepsi Light and Pepsi Max seems to be Acesulfame Potassium. Acesulfame Potassium is a calorie-free artificial sweetener. Pepsi Max uses Acesulfame Potassium and a sweetener known as Aspartame. While, Pepsi Light uses only Aspartame.

Source

Hmmm, now the big question: Which is better? If I had to choose, I think it'd be Pepsi Light

Neither, Go for full fat. Not because its a personal choice, because of a chemical used in dietary drinks. Which causes a disfunction in the bladder and it is worse for females than males.
Today is Saturday, this was told to me Wednesday night by a surgeon in my local pub. Just thought I would tell you that to give my post a bit of credibility.

Well, since this questino can not really head anywhere now, I shall close this thread.

...... BTW... Drink coke