Think of it this way: Seltzer is the indie rock band—raw, unfiltered, and it doesn’t care if you like it or not. Soda water is the pop song with a polished producer—smooth, universally appealing, and designed to get along with everyone.
Or try this: Seltzer is a glass of cold milk—pure and honest. Soda water is a cup of tea with a dash of salt—still tea, but with a subtle complexity you didn’t know you needed. Which one do you reach for when your tongue feels dry?