To be considered a rye whiskey, a drink must consist of at least 51% rye — with the remaining 49% made up of other grains — and must be distilled in a new charred oak barrel.
Both liquors have similar hints of sweet, oaky flavors. However, rye whiskey can be spicier and drier than bourbon, with more prominent earthy undertones.
Due to this, rye whiskey is less popular to drink neat. Instead, it is a common choice in cocktails with sweet notes to cut through the whiskey's sharpness.
Bourbon must be made of at least 51% corn, and that corn majority results in a smoother, sweeter liquor that's easier to sip and shines in classic cocktails like old fashioneds.