The points based system while good wasn't so objective but rather subjective as some details got a whole 1 point while others got 0.5 point.
Personally, I like the exterior of the BMW and those power train numbers are also impressive, considering the size. I however like the interior of the Benz especially the steering wheel and front seat designs.
I wonder why Benz and BMW are using outdated interiors when they both have newer designs in there respective fleets and this is where the Audi A8 beats them (more advanced interior and tech features plus improved suspension setups to possibly dismiss all speed bumps when equipped for that)