I laugh when I hear people say the "zero sugar" and "diet" versions are better for you, they're much much worse.
Ah yes - this old Chestnut.
Personally I don't wear the foil hat, so find a lot of the claims that diet drinks are worse for you as utter tosh.
However you cannot argue against 139 calories and 39g of sugar which you find in a can of "regular diabetes".