BMW 3 Series Touring (2017) is 250 mm (9.84 inch) longer, 25 mm (0.98 inch) wider and has 9 liters (0.32 ft3) bigger cargo space than Mercedes B-Class (2014).
Mercedes B-Class (2014) is 128 mm (5.04 inch) higher and 359 kg (791 lbs) lighter than BMW 3 Series Touring (2017).