My take:
Diet Pepsi is better than Diet Coke.
However, regular Coke is better than regular Pepsi.
Neither should be drunk, nor should any soda, because it’s all a form of legal yet highly poison…but that’s besides the point of which is better.
Discuss.
Bookshelf Battle 
I don’t like both, only once a year I have it
Your willpower is an inspiration to all 3.5 of us.
Coke Zero is the best. But I like Pepsi too. Diet Coke is the worst.
I’m not a Coke Zero fan.
My MIL doesn’t like it either.