This is sweetened with sucralose. In a recent study, fruit flies fed sucralose consumed more total calories than those fed sugar:
http://abc.net.au/news/2016-07-13/research-shows-artificial-...
Fruit juices have vitamins and minerals that soda does not. With that said, there's also a huge difference between the old herbal beverages (Cocaine & kola nut flavorings, "root beer", 21 natural plant flavors, etc), and modern artificially-colored and artificially-flavored concoctions.