I have been drinking Coke Zero for the last like 7 years.. i just recently switched to Dr Pepper Zero. They both taste way better than their Diet oounterparts.
I always heard Diet drinks make you gain weight more than regular soda... i am not sure of the science behind that thought, but over the last 2 years i have lost 60 Lbs and if anything, my Coke Zero/ Dr Pepper Zero intake has doubled since i started my weight loss. If i have a bad craving for Sugar, i'll just drink a Zero...
But before then, i preferred Coke products, but i would basically drink any flavor if it was available. Coke, Pepsi, RC cola, Sams choice, it didn't care, especially if it was free..lol