Purchase decision Audi Coupe 5Cylinder or V6

Hello, currently driving a Golf 4 V5 and wanted to buy an Audi Coupe as a second car. But I’m not sure about the engineization. Is the power difference between the 5 cylinder and 6 cylinder large? From the consumption they should take nothing…. I tend to the 5 cylinder actually, but I’m afraid that he is too sluggish… And I’ve heard about problems with the injection often. Hope you can help me. Thank you very much Michael