Two SUVs with some similarities, but otherwise different in most aspects such as the starting price, horsepower, fuel economy, and ground shadow size. First of all, there is a notable difference in the starting price of the 2015 Acura RDX, which is $25,505 less than the base MSRP of the 2016 BMW X6. Also, the 2016 X6 has bigger and thirstier engine; the 2015 RDX gets 3.2 more mpg. And finally, the RDX is slightly smaller than the X6. Among similarities are the body structure, market segment, height, and maximum occupancy.