Two SUVs with some similarities, but otherwise different in most aspects such as the model year, horsepower, fuel economy, height, and maximum occupancy. First of all, there is a difference in model years. The is 2 years newer. Also, the 2014 Acadia has bigger and thirstier engine; the 2016 CX-9 gets 5 more mpg. In addition, the roofline of the Acadia is slightly higher than the CX-9's. And finally, the GMC Acadia seats one more passenger than the Mazda CX-9. Among similarities are the body structure, starting price, and ground shadow size.