Pepsi over RC, RC over Coke. Actually darn near any soda over Coke. Diet Coke over Diet Pepsi (preferably caffeine free...it has a sweeter taste). Diet Mt. Dew over all of them. That said, Propel Zero (grape) is my preferred drink most of the time. I go in phases of what I like after that. At work I get Diet Mt. Dew most nights. I get a 32 oz cup, half of which is ice and drink about half that before dumping it out and refilling again. So most work nights I figure I drink about 20-30 oz of Dew. During the summer I will use the 32 oz cup and make my own Hawaiian Punch and usually drink two during the night. Caffeine only makes me pee more often. No headaches, no staying awake, no shakes etc. Honestly, the whole caffeine argument is one of those Mormon Pharisee things we do. Some people don't consume it, fine, that is their choice. Those in that group who then try and denigrate/persecute the ones who do consume caffeine really need to take a step back. If consuming caffeine was as horrible a violation of the gospel as they say, we could not attend the temple, make and keep our covenants. If you don't keep the Word of Wisdom, you don't go the temple. Period. It is that simple.