BMW’s M6 Cabrio faces off against the mighty Mercedes-Benz SL63 AMG

AutoExpress puts two of the most expensive and powerful sports cabriolets money can buy to the test around Blyton test track – BMW’s all-new 2013 M6 Convertible vs. the all-new 2013 Mercedes SL63 AMG. On paper, the two are very similarly rated power-wise but who will emerge victorious and which would you rather plunk your cash down on?