What taste better Pepsi or Diet Coke?

This is a matter of personal preference and there is no factual answer on what taste better as one person may prefer the taste of Pepsi while another may prefer the taste of Diet Coke. Taste perception can be influenced by factors such as individual's taste buds, cultural background, expectations and personal preferences. What one person may find delicious may not be the same for another. Both Pepsi and Diet Coke have their own unique flavor profiles and each person's taste experience can be subjective and vary.