I'd have to say either Audi or Mercedes-Benz, but I voted for Audi.

Audi IMO, doesn't have a strange or funny looking car in their lineup. Their design language is cool, crisp and clean. No bulging wheel arches like an S-Class, not funny cut-lines like certain BMWs. I think Audis, inside and out have the best "designs" of the European brands. The only brand the compares on the whole as a brand is Porsche, but the Cayenne is even an acquired taste.

Audi, Mercedes, Porsche, BMW, Jaguar, after that its pretty much up in the air, IMO.

M