Jack Herer. So distinct I can't even begin to describe it. I guess if I tried I'd say it had a pungent, spicey, peppery, and pinkey smell, with a distinct skunky pineyness that I have never smelled in any other strain.
K train also had a great earthy, spicey smell that was incredibly distinct. Smelled like something in an Arab's spice cabinet... kind of like Za'atar.
I like fruity flavors as well, but they seem much more common, so they excite me much less than the spicey, earthy flavors.
The only flavors I like to add to bud are homegrown peppermint and clove. Peppermint adds a very strong and lasting mint flavor, which is great to mask or enhance flavor. Clove has to be added extremely sparingly, but when added properly I can get a flavor reminiscent of a kretek cigarette (minus the tobacco), which I enjoy from time to time. These added flavors tend to ghost whatever vaporizer you are using, so if you go overboard you might have to clean your piece to get rid of the smell/taste.