AAA The S90 is the more modern car and makes the A6 feel a bit outdated. We love the Volvo’s design and the interiors too are superbly finished with top-quality materials and a light, airy feel. The engine isn’t as refined or punchy as we would have liked but, overall, the S90 offers a very luxurious experience. The A6 too is a very good car and, as it nears the end of its lifecycle, Audi has thrown lots of features into it to maintain its appeal. Apart from being very well-equipped, it’s refined too and you can get some great deals on the A6 these days. It’s just that it’s now a bit old compared to its rivals.