The horsepower is a characteristic that most of drivers pay the biggest attention to. In this comparison, it is the Hummer H3 that has by 20 horsepower more than the Audi Q7 SUV, which makes this car slightly quicker. Because of more horsepower the Hummer will also provide somewhat more efficiency in specific speeds.
If you need a vehicles by which you could set of for travels, which could load more luggage , decide to buy the Hummer H3. The Audi has by 8 percent less capable boot in comparison to the Audi Q7 SUV 3.6 FSI 280HP automatic 4x4 so probably you would be able to put in the trunk one small parcel less. Examining the luggage compartment also check its dimensions which have substantial effect on loading possibility .
The higher a car is, the better is the comfort of boarding it and greater capacity of loading massive amount of stuff to it. The difference at the level of 9 % in favor of the Hummer H3 5.3 300HP is little and does not matter much.