Coke? or Pepsi?

Coke or Pepsi, which to choose, both look and to most, taste very similair, so why do we choose one over the other? could it be Coca Cola's long time campaigns dating back to the 40's that even our generation recognizes, or is it Pepsi's clever commercials and advertising techniques that stick in our head. Personally, I enjoy the taste of both Coke and Pepsi, I can taste the difference between the two very easily, yet I still find they taste very similair.  If I were to order food at a restaurant and the asked me "Coke or Pepsi?" I would choose Pepsi,  I like the sweeter taste of it,  I drink pop on a regular bases, diet only, reguardless of "how bad it is for you" I love the taste, and its zero calories! can't go wrong there.  I would definately consider pop to be in the "junk food" category, that being said, I think diet pop is not considered a "junk food" because there are no calories or sugar.  Yes there are tons of chemicals to make up for the fact that they dont use sugar, but the taste is amazing.  When it comes to eating properly, I've been raised with healthy eating my entire life, I love eating healthy and eating vegetables, fruits etc. I like to keep my weight and appearance completely under control, and eating the right foods helps me achieve that.  That being said, when it comes to eating "junk food" I could live off of it, I absolutely love it. Anything from chips, candy, cookies, cake, brownies, ice cream I will eat.  The problem I have with junk food is that once I start eating it, I cant stop.  There's no "saving some for later" when it comes to that, if theres a bag of chips, I'll eat the whole bag. Its a love/hate relationship.