Mercedes GLA-Class (2015) is 279 mm (10.98 inch) longer, 24 mm (0.94 inch) wider and has 21 liters (0.74 ft3) bigger cargo space than Seat Arona (2020).
Seat Arona (2020) is 58 mm (2.28 inch) higher and 302 kg (666 lbs) lighter than Mercedes GLA-Class (2015).