It can be a matter of playing with the balance of a fantasia flavor like cola, which is a mix of citrus**, vanilla, and one of cassia or cinnamon. The Orange-Vanilla Coca Cola @Odesio mentions above kind of turns up the dial on the citrus and vanilla flavors versus the original drink.
I’ve always found extra citrus in cola to be an upgrade. Plenty of folks are in agreement.
** Coca Cola uses (used?) orange as their citrus dimension, Pepsi Cola uses (used?) lemon. Probably not current information, but that was once the main distinguishing factor in their respective flavors. Source is one of William Poundstone’s Big Secrets books.