The beer that you use will greatly affect the flavor of the bread. Using a fairly generic beer (Bud in my case) will produce a bit of flavor in the bread, but nothing particularly strong and it's very unlikely that anyone will even identify it as beer. Very light beers, such as Corona, will be almost unnoticeable. Using more flavorful beers and ales — say, Sam Adams, will have more flavor and dark beers even more. These are great with chili and bean soups. If you have a choice of beers, choose whichever one you think would best accompany the meal if you were drinking it.