Two SUVs with some similarities, but otherwise different in most aspects such as the powertrain, starting price, horsepower, fuel economy, and maximum occupancy. First of all, the 2015 GMC Yukon has bigger and thirstier engine; the 2016 Mercedes-Benz GL-Class Diesel gets 5 more mpg. Also, the 2015 Yukon is priced $15,860 lower compared to the base MSRP of the 2016 GL-Class Diesel. In addition, there is a difference in the number of passengers; the Yukon seats one more the GL-Class Diesel. Among similarities are the body structure, ground shadow size, and height.