Two SUVs with more similarities, such as the body structure, market segment, starting price, ground shadow size, and maximum occupancy, than differences, like the horsepower, fuel economy, and height. First of all, the 2016 Infiniti QX50 has a more powerful engine than the 2015 Acura RDX, and it gets 2.5 fewer miles on a gallon of fuel. And finally, the roofline of the 2015 RDX is slightly higher than the 2016 QX50's. Among similarities are the body structure, market segment, starting price, ground shadow size, and maximum occupancy.