Can You Really Taste The Difference In A Single-Barrel Bourbon? - Tasting Table
Briefly

Single barrel and double barrel bourbons differ mainly in their maturation processes, affecting their flavor complexity. Chris Walster, a whisky expert, states that single barrel bourbons lack the complexity found in double barrel bourbons, as the flavors are more pronounced in the latter due to a second barrel. This second maturation enhances flavor diversity and can correct issues from the first barrel. However, flavor preferences are subjective, and some may prefer the simplicity of a single barrel.
"The typical reason comes down to the difference in the maturation of the bourbon. A single barrel bourbon won't be as complex in flavor compared to a double barrel."
"With any whisky, 'beauty is in the eyes of the beholder.' If you prefer a single barrel, absolutely fine. A double barrel does nothing for you."
Read at Tasting Table
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