2 votes already. A tie.
I think Zoodiver nailed it when speaking about ancient us muscle and today's models.
What i understand from today's models is that they promise more than they give ( bar the high ends ) and do not compare with imports ( european, mostly ) of the same level, in terms of engineering and materials used.. This is what i hear from friends who live for cars.
I have always driven BMW as family and work, and Porsche for fun, and yes i love to drive a Porsche in a winding european road.
As to BMW being the best, it is not my opinion, however. I do not think it compares to Mercedes, on the same category. I think BMW are, among europe's best brands, the most dangerous. I allways keep it in mind.