Darker alcoholic beverages likely cause worse hangovers due to higher concentrations of congeners.

“the conjuners, which means when the alcohol gets made, you have the byproducts of alcohol metabolism compounds that end up in your alcohol. They don't cause the hangover, but they can worsen it.”

“alcoholic drinks not only vary in their alcohol content but also in their coner content congeners are chemical byproducts of the fermentation and distillation processes they contribute to the taste Aroma and color of alcoholic beverages these substances include compounds like methanol Esters tannins histamines and alahh drinks that are rich in congeners such as Brandy red wine rum and whiskey tend to produce more”