Two upmarket luxury sedans: One is a more traditional four-door, the other a five-door hatchback that calls itself a "Gran Coupe." Both will appeal to your higher fashion sense. The BMW offers unparalleled driving performance, the Mercedes hits back with a sophisticated interior. Editors James Riswick and Mike Monticello debate the merits of each, including their performance, comfort, interior quality, cargo, value, fuel economy and which is more fun to drive. Tell us your pick in the comments below: the BMW 428i Gran Coupe or the Mercedes-Benz C300?