On a food label, what’s more important — grams of “Sugars” or “Total Carbohydrate”?

The latter. Do not use the number of grams of “Sugars” listed on the food label to predict how a food will affect your blood glucose level. “Total Carbohydrate” will give you a more accurate picture of how a serving of a particular food will affect your blood glucose level since it takes into account all of the carbohydrates that will affect blood glucose.