Amazing result with only 6 votes so far...! (All 6 votes for cola !?!)
I had to think about this one a bit and I chose cola. In fact I probably drink 3-4x coffee vs. cola, but not because I prefer it! Coffee serves a function for me, and satisfies a habit. But later in the day when I can actually think about what I'm doing, I'm much more likely to grab a diet cola of some form...