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Bourbon vs Scotch

Both are oak-aged grain whiskies. Bourbon uses new charred American oak (aggressive extraction); Scotch uses used oak (slower extraction) and sometimes peat smoke. Bourbon is more legally constrained — no additives allowed — but the new oak does more chemical damage per year.

Bourbon

American oak, corn-led, congener-rich

Hangover Index
7/10
Heavy
Chemistry
Congeners
High
Histamines
Moderate
Polyphenols
Moderate
Sulfites
Very Low
Tannins
Moderate
Sugar
Low
Additives
Very Low

Scotch

Aged, peated, complex chemistry

Hangover Index
7/10
Heavy
Chemistry
Congeners
High
Histamines
Moderate
Polyphenols
Moderate
Sulfites
Low
Tannins
Moderate
Sugar
Very Low
Additives
Low
Verdict

Scotch wins narrowly, in the form of unpeated Speyside or grain-heavy blends. Peated Islay malts and sherry-cask styles lose to bourbon. The "right" Scotch is lighter than the "right" bourbon; the "wrong" Scotch is heavier.

Which one for which situation

You're sensitive to phenols (smoke)
→ Bourbon
All bourbon is unpeated. Some Scotch is heavily peated — major trigger.
You're sulfite-sensitive
→ Bourbon
Bourbon never sees sherry casks. Scotch often does — sulfite carrier.
You want zero added coloring
→ Bourbon
US law prohibits caramel coloring in bourbon. EU permits E150a in Scotch.
You want a chemically lighter sipper
→ Scotch
Glenlivet 12 or Johnnie Walker Black carry less congener load than most bourbon.

FAQ

Is Scotch healthier than bourbon?

Marginally, when you pick unpeated, non-sherry-finished Scotch. Bourbon's new oak extracts more heavily than Scotch's used oak. But peated Scotch can be heavier than bourbon for sensitive drinkers.

Which has more calories, bourbon or Scotch?

Effectively identical at the same ABV. Calorie differences between brown spirits are not meaningful.

Does bourbon give worse hangovers than Scotch?

Usually slightly worse. Bourbon's aggressive new-oak congener extraction outweighs Scotch's typical chemistry, with the exception of heavily peated or sherry-cask Scotches.