I don't really mind, but if I had to choose, well I guesse I would go with Coke. Dr Pepper is great, but everyone in my family hates it. So coke is the one I almost always have. Other then that, I like both.
Whenever I go to get lunch or something, usually from the gas station or Burger King, I get Dr. Pepper. The gas station becouse their coke tastes weird sometimes and Burger King out of habbit. But, I'm more than happy to drink coke, however I do usually chose Dr. Pepper.
Like TexanProvo, I usually choose Dr. Pepper. Although, if I can get Coca-Cola in a glass bottle, I'll buy that over anything, hands down. Aluminum absorbs so much of the flavor, but it's cheaper to produce and easier to ship than glass, so the companies use that instead.
I love Dr. Pepper. BUT the best is getting it straight from Waco Tx, Where the plant is, or from Dublin Tx. Those are the only two places where they use real cane sugar... It makes a major difference in the taste.