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The amount of time that a coffee bean is roasted plays a huge part in the flavor of the final cup. Medium Roast coffees produce a milder tasting cup of coffee; Dark Roast a stronger brew. So it really depends on what taste strength you prefer. As a general rule the medium roast is the more popular, although some gourmet coffee lovers prefer the stronger taste of the darker roasts.
Try here for a variety of medium and dark roasted gourmet coffee beans.