Which alcohol drink contains most sugar?

The mixer. Alcohol is 7 calories/gram, so the one with the most alcohol has the most calories -- however, they are not sugar. That is found in the mixer, such as soft drinks, fruit juice and the like -- plus all the food you consume while you're drinking.
Depends on the mix. Sugar content in alcoholic drinks is dependent on the mixer. Bartenders use liquid bar sugar to sweeten drinks. Orange juice has about 24 g of sugar per cup pomegranate juice has 35 g. Without the mixers, distilled liquor has no sugar or carbohydrates. Beer has no sugar but does contain carbs. A glass of wine has 3-5 g of sugar liqueurs like kahlua have sugar added 11g per ounce.