Original Stewart's sodas are creamy, full-bodied, and come in glass bottles. However, they use high-fructose syrup and artificial flavors, which ruins that "old-fashioned" taste.
Jones Soda has a rich taste that comes from inverted cane sugar and natural and artificial flavors. While the soda is great, newer brands have arrived and raised the bar above it.
Zevia makes decent zero-sugar sodas with no artificial ingredients, but they don't pack a rich, sweet flavor like sugary sodas, and have an unusual taste due to the use of stevia.
Swamp Pop uses natural flavorings, and some fruit flavors even include actual fruit pulp. However, these sodas can be extremely sweet, so some may prefer lighter options.
Dad's is a classic brand that is famous for its root beer. The brand's flavors don't have the nuance of modern sodas, but this is sure to please vintage soda devotees.