Two SUVs with some similarities, but otherwise different in most aspects such as the powertrain, starting price, ground shadow size, horsepower, height, and maximum occupancy. First of all, the 2016 Mercedes-Benz GL-Class Diesel produces fewer horsepower than the 2015 Acura RDX. Also, there is a notable difference in the starting price of the 2015 RDX, which is $28,505 less than the base MSRP of the 2016 GL-Class Diesel. In addition, the RDX is both significantly smaller and slightly shorter than the GL-Class Diesel. And then, you'll seat two more passengers in the Mercedes-Benz GL-Class Diesel than in the Acura RDX. Among similarities are the body structure, market segment, and fuel economy.