When I saw this was a poll, I had to ask WTF!!! Is there really any other than the regular???
A hole-in-the-wall BBQ joint I have been going to for better than 40 years serves Sundrop as the only bottled drink available (other soft drinks are fountain). Top Hat BBQ in Blount County has served Sundrop for as long as I can remember; and I have been eating there since I was a mere slip of a small boy.
Forget the poll. Don't be swayed by the offerings of the other two flavors. Go for the green (yellow?)(Yellow/green??!!) goodness in its full color and calories (unless you are diabetic, then sugarfree is acceptable. But not the red stuff, for the love of all that is tasty!!!