I'm guessing sweet shots or sour drinks are high-ranking
flavors.
Candidates include cream drinks (with bailey's, advocat,
amarula) and some other sweet flavor (e.g., amaretto, gran marnier,
frangelico, kahlua, triple sec, etc.).
Specific examples are shots lilke: b52s, china whites, and
tropical drinks like: pina coladas, painkillers...
Sour drinks might include: lemon drops, whiskey sours, amaretto
sour, etc. I used to bartend and a few times have made an amaretto
sour that got several experienced drinkers to say "Best drink ever
tasted. Ever." (but, I cannot reliably replicate and usually make
merely "nice" versions). We're talking 'bout making sour mix from
scratch, using raw (pasteurized) eggs to foam the drinks... old
school... and getting the perfect balance of sweet/sour. Otherwise,
I'd look elsewhere.
A well-made espresso or fig martini, mojito, and other cocktails
can be high craftmanship drinks that deliver. But, if I was
suggesting ONE easy but tasty drink, I'd bet on a shot that had
bailey's as a main ingredient. I don't know: how bout an f16:
1 part kahlua, 1 part frangelico, 1 part bailey's Irish cream.
layer in order listed (by pouring slowly over the back of spoon so
that shot has layers of color, with bailey's floating perfectly on
top).