I'm not into chocolate but my better half loves chocolate raspberry so I did try several different chocolate flavorings until finding what she liked best. Most of the ones I tried tasted like milk chocolate, not dark chocolate with one exception. Taste is highly subjective and with that in mind here's my observations/opinions; TFA bittersweet chocolate extra was the only "dark" chocolate flavoring I ran across, less sweet than the others it tasted something like the unsweetened Hershey cocoa powder used in baking. TFA double chocolate (
dark) tastes like a milk chocolate Hersey bar and double chocolate (
clear) tastes like milk chocolate frosting, of the two the dark version tastes
slightly better but is harder on wicks/
coils. FA chocolate also tastes like milk chocolate similar to TFA's double chocolate but not quite as good. Inawera chocolate tastes like an old fashion tootsie roll. Capella double chocolate has a
slightly darker milk chocolate taste but also has an off flavor note unique to many of Capella's flavorings. For my wife's mix I ended up blending TFA and Inawera flavorings to create the "chocolate" nuance for her mix. Best of luck to you and hope you find the taste you're looking for.