Buick Regal (2014) is 1 mm (0.04 inch) wider than Opel Insignia Country Tourer (2015).
Opel Insignia Country Tourer (2015) is 82 mm (3.23 inch) longer, 30 mm (1.18 inch) higher, 65 kg (143 lbs) lighter and has 138 liters (4.87 ft3) bigger cargo space than Buick Regal (2014).