For conventional convenience-store candy, probably Snickers or Heath bars. Non-chocolate (sacrilege) I like hard sour candy, preferably citrus.
Getting serious, I want good dark chocolate in the 70%-85% range, but Dove Dark Chocolate Promises can be an acceptable commonly-found fix.
Funny factoid: listening to NPR a few years ago, in an interview with a European chocolate expert, the interviewer asked about iconic American "Hershey Bars"
The expert sputtered about how awful they are, and described them as "having off notes of cardboard and vomit"