Mine is Gatorade. This has been my buddy for years of training. It keeps me fueled and hydrated, powerful enough to meet the challenges I am always faced with my training and other sweat-soaking activities. I really feel the power that it gives me. It's really different from drinking water. Water has no calories and it has, so there's actually an obvious reason for such. I haven't tried any other exercise energy drink; I don't think I would have to.