Nissan X-Trail (2014) is 1073 mm (42.24 inch) longer, 140 mm (5.51 inch) wider, 292 mm (11.50 inch) higher and has 352 liters (12.43 ft3) bigger cargo space than Seat Mii (2017).
Seat Mii (2017) is 469 kg (1,034 lbs) lighter than Nissan X-Trail (2014).