I rarely drink soft drinks, but between the two, Coca-Cola and Pepsi, I prefer Pepsi, but only by a slight edge. I do not drink the "diet" versions, just the real thing. Looks as though my instincts about artificial sweeteners are right on the money, as now there are reports about how they aren't healthy for anyone..... Well, DUH.... My body told me that a long time ago both with the chemical aftertaste and the later reaction that I experienced with foods and beverages containing those products. Easy enough to avoid, thankfully.
In general, though, my main beverages of choice are water, coffee and iced tea, along with beer.