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, although the 2016 Mercedes-Benz GLA-Class has a more powerful engine than the 2016 Audi Q3, it gets 5 more mpg. And finally, the 2016 Q3 has a slightly taller body than the 2016 GLA-Class. Among similarities are the body structure, market segment, starting price, ground shadow size, and maximum occupancy.