So I guess if you drink a coke once in a while, diet coke is better and if you drink coke very often, you should stop drinking coke.
no one has to make that choice
I only drink normal Coke but sparingly. Usually I'm having water or plain black coffee. I think the takeaway is that diet Coke doesn't allow you to train yourself to enjoy normal sweet foods again. I just had an apple and strawberries and it is basically candy to me.
Edit: I have a question. Rank these food items by how healthful they are:
a) 150 calories of Coca-Cola Classic
b) 150 calories of fresh fruit
c) 0 calories of Diet Coke
Are you considering mental well-being as well, or just pure physical health? Because in case of the former, option b) will end up with the lowest score.