I only watched a couple of episodes but what strikes me as the difference between the two finalists is that IMO Mitch would appeal more to urban, hip crowd while Kimberly (who struck me as being Martha Stewart lite) would get more of the suburban, small town type of people. SO Mitch would be a bit, excuse the overused expression, more edgier and risky, and Kimberly would be the safer choice.
It was also interesting to see that Mitch seemed to have definite, specific ideas on what he want and Kimberly had more general ideas and relied on the planners to to suggest the details.
As to drinks, another telling point is the Mitch used a drink he created and Kimberly used a drink suggested by the caterer, though in the rock garden she was acting like she created it.