If your going off of taste, I might go with Pimp Juice. Rockstar is too big of a can for me to enjoy. I start with a smile, but after I drink enough of the Cherry Dr. Pepper on PCP, I tend to gang near the end of the can, that is if I finish it.
Sales wise, I give it to Rockstar. I'd like to get a try of Sum Possy. I heard from a real person that the drink tasted good.
In Pittsburgh we don't have much of a choice, other than Red Bull and the occasional Rockstar but I'd like to see more of a choice in the clubs with the energy drinks available. And I thought you had it tough in the UAE.