I am going to brew Jamil's Kolsch soon, but I realized that different sites have different versions of this recipe. Some have Hallertauer Hallertau hops, while others have Hallertauer Hersbrucker. Is there a big difference between these two? I know Hallertau is a noble hop and Hersbrucker isn't, but I'm not sure that makes a difference. What would be a better choice for a kolsch?