Rosenthal: New BMW M5 or Audi S6?

Which is the better car? The 2013 Audi S6, with a base of $73,400, or the 2014 BMW M5 starting at $92,800? There’s no doubt the M5 has the power to get it done, but for the price does the S6 have what it takes to steal the show? Steve compares everything from handling and speed to style and value.