Regular by far man, because a lot of diet pops contain Aspartame which can cause all kinds of messed up things, and i know that studies show that it's "safe" but im just not willing to take the risk of them coming out in a couple years and admitting that it really does cause all those things, besides diet pop tastes nasty
It doesn't matter to me. I will drink both. I like diet drinks because it saves you a ton of empty calories that people don't need. And If I want to drink soda once in a rare while I will drink the regular.
I never liked having diet drinks. They have a stronger taste of artificial drink and seem to have more sugar then the normal ones IMO. But I don't care of having a diet drink if I am thirsty but normal drinks will always be my choice.