Q. What about the performance of the car in off-road and hilly areas? What about the ride height of Creta in comparison to Brezza?

In my view, As ground clearance difference r marginal,but Keeping in mind, for the Hills:-1)less Bodyroll, 2)Bettermilage, 3)lowest maintenance,BREZZA r the better than CRETA.

Offroad performance is depend on driver but its 2wd that mean 2 wheel drive so offroading is not so good and height is litte bit difference with brezza

Creta is better car in every way comparing to brezza. You get better equipment and better power delivery for the hilly rides and definitely I'm not sure about the numbers but creta has bigger clearance.