BMW 3 Series (2015) is 25 mm (0.98 inch) wider than Nissan X-Trail (2014).
Nissan X-Trail (2014) is 6 mm (0.24 inch) longer, 341 mm (13.43 inch) higher, 65 kg (143 lbs) lighter and has 85 liters (3.00 ft3) bigger cargo space than BMW 3 Series (2015).