The interior dimensions of, let’s say a BMW X3, is exactly the same as a bmw 3 series. Outer dimensions are even slightly smaller. The trunk is also the same horizontally, though being higher vertically (which is negligible in daily life). The space underneath the car is higher which is useless if you don’t go off-road.
The only pro you are getting is you are sitting higher. But the price is around 25-30% higher.