Two Wagons with some similarities, but otherwise different in most aspects such as the powertrain, starting price, horsepower, fuel economy, ground shadow size, height, and maximum occupancy. First of all, the 2015 Mercedes-Benz E-Class Wagon has a more powerful engine and gets 12 mpg less than the 2016 BMW 3 Series Wagon Diesel. Also, there is a $14,850 difference in the base MSRP. The 2015 E-Class Wagon has a higher starting price than the 2016 3 Series Wagon Diesel. In addition, not only 3 Series Wagon Diesel is slightly smaller, but it's also shorter than the E-Class Wagon. And then, the Mercedes-Benz E-Class Wagon seats two more passengers than the BMW 3 Series Wagon Diesel. Among similarities are the body structure and market segment.