BMW 3 Series Touring (2016) is 214 mm (8.43 inch) longer, 15 mm (0.59 inch) wider 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 and 15 kg (33 lbs) lighter than BMW 3 Series Touring (2016).