BMW 3 Series (2015) is 207 mm (8.15 inch) longer, 6 mm (0.24 inch) wider and has 59 liters (2.08 ft3) bigger cargo space than Mercedes GLA-Class (2014).
Mercedes GLA-Class (2014) is 65 mm (2.56 inch) higher and 170 kg (375 lbs) lighter than BMW 3 Series (2015).