BMW 3 Series Touring (2015) is 214 mm (8.43 inch) longer, 15 mm (0.59 inch) wider, 80 kg (176 lbs) lighter and has 90 liters (3.18 ft3) bigger cargo space than Mercedes B-Class (2020).
Mercedes B-Class (2020) is 133 mm (5.24 inch) higher than BMW 3 Series Touring (2015).