Napa Valley vs Bordeaux
This is not an argument. They are both great! They are two different styles.
Napa usually has 80 – 100% cabernet grape. Bordeaux (Left Bank) usually has 70% or less cabernet. Napa will offer more diversity in complexity because of the geography. Napa has more elevation. Bordeaux is more blended.
Napa is better with fattier cuts of meat and Bordeaux is better with less fat and sauces. Bordeaux ages better because of it’s style and less alcohol. Every Bordeaux vintage is different because it is grown naturally where Napa tries to make every vintage taste similar.
Napa is more fruit forward than Bordeaux’s soft and elegant blends. Either way, you have a high class problem if these are your choices.