At present there is a fierce battle between American & Japanese car manufacturers to establish themselves as the premier car manufacturer. In 2014 it was impossible to separate them and the market was spilt 50/50. Moreover, the top selling cars of 2014 in America included a mix of both American & Japanese Cars.
Comparing them in the J.D Power vehicle dependability study was interesting. Again, it proved difficult to separate them. These studies have no bias which gives the results extra credence.
It seems that car buyers tend to prefer one of the other and it can be difficult to change their minds. A lot of the time this can be influenced by marketing and may have no reflection on the actual quality of a car.
(See Other Interesting Infographic: Uber: The Definitive Fact File)
This info-graphic from Touchdown Auto discusses American & Japanese cars from every perspective and aims to get to the bottom of which is better, if any, once and for all.