Bohemian Pilsner / Pilsener
Bohemian pilseners are medium bodied, and they can be as dark as a light amber color. This style balances moderate bitterness and noble-type hop aroma and flavor with a malty, slightly sweet, medium body. Extremely low levels of diacetyl and low levels of sweet corn-like dimethylsulfide (DMS) character, if perceived, are characteristic of this style and both may accent malt aroma. A toasted-, biscuit-like, bready malt character along with low levels of sulfur compounds may be evident. There should be no chill haze. Its head should be dense and rich.
  

Top Ten Bohemian Pilseners Ranked by the US Open Beer Championships

 
German Pilsner / Pilsener
A classic German Pilsener is very light straw or golden in color and well hopped. Hop bitterness is high. Noble-type hop aroma and flavor are moderate and quite obvious. It is a well-attenuated, medium-light bodied beer, but a malty residual sweetness can be perceived in aroma and flavor. Very low levels of sweet corn-like dimethylsulfide (DMS) character are below most beer drinker’s taste threshold. Other fermentation or hop related sulfur compounds, when perceived at low levels, may be characteristic of this style. Fruity esters and diacetyl should not be perceived. There should be no chill haze. Its head should be dense and rich.

Top Ten German Pilseners Ranked by the US Open Beer Championships

American Pilsner / Pilsener
Light in body and color, American lagers are very clean and crisp and aggressively carbonated. Flavor components should be subtle and complex, with no one ingredient dominating the others. Malt sweetness is light to mild. Corn, rice, or other grain or sugar adjuncts are often used. Hop bitterness, flavor and aroma are negligible to very light. Light fruity esters are acceptable. Chill haze and diacetyl should be absent. 
 

Top Ten American Pilseners Ranked by the US Open Beer Championships