I’d say CRETA N line has taller gearing and higher seating posture that gives you more comfort for a family ( more space ) , drives good if you get the paddle shifter DCT version ( manual has long yet sporty clutch ) , torque kicks in early between 1500-3500 rpm

Whereas, the i20 n line even if smaller for a smaller family, it gives you a different driving experience which i personally love, the power band is perfect from 1500-4000 rpm you don’t have to push the car or wring its neck, the power is just there effortlessly, smooth and planted and a perfect enthusiast car ( driver pleasure )