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French roast
This is a particularly dark roast of coffee--about as dark as it gets without compromising flavor. An overdone French roast tastes bitter and smoky.

Colombian Darkness
Colombian coffee comes in a variety of roasts. However, most Colombian coffees are characterized by a mild flavor with a slightly more acidic taste than French roast. This is the result of the beans' being roasted less, making them lighter in color.

French and Colombian coffee beans found in an American store differ slightly from their reputations. French-roast beans in America tend to be slightly lighter than what you may find in a European cafe; European coffee drinkers prefer darker beans. Colombian beans, on the other hand, can be simple, clean and dull. Big-name brands of Colombian coffee typically fall into this category of slightly boring brews, whereas coffee from smaller farms and lots has more character.

Deciding which coffee is best depends entirely on your own personal taste. Due to its milder, less-burnt taste, Colombian coffee is a good starting point. From there, you can sample darker roasts until you find the level of acidity and body that you prefer.