Performance
With that kind of horsepower, both the HUMMER H2 SUT and the Infiniti are legitimate sportscars.
Handling
With its tighter turning circle, the Infiniti FX50 is definitely sprier than the HUMMER H2 SUT, something to consider if you do a lot of city driving; however, note that a vehicle with a tight turning circle may feel a bit twitchy on the highway.
Drivetrain
The HUMMER H2 SUT has a bigger engine than the Infiniti FX50. Remember that smaller engines are often cheaper to fix, but a smaller engine usually has to work a little harder.
Torque is the force that lets you accelerate quickly, and in this respect, the HUMMER H2 SUT is substantially more powerful than the Infiniti FX50.
Utility
Neither the HUMMER H2 SUT nor the Infiniti FX50 has a marked advantage with respect to seating capacity.
The HUMMER H2 SUT is a better choice than the Infiniti FX50 as far as hauling capacity, especially if you frequently need to carry a lot of suitcases or sizeable dogs.
The HUMMER H2 SUT outpulls the Infiniti FX50 by a sizeable margin.
Comfort
Taller drivers will significantly enjoy the extra head room in the HUMMER H2 SUT's front cabin compared to the Infiniti FX50.
The ampler interior dimensions of the HUMMER H2 SUT make it substantially more spacious for your passengers than the Infiniti FX50.
Dimensions
The HUMMER is tremendously heavier than the Infiniti FX50.
Your wallet will hurt more every time you fill up the HUMMER H2 SUT than the Infiniti because of its larger tank.
The H2 SUT and the Infiniti FX50 compete for the same parking spaces.
The HUMMER H2 SUT's longer wheelbase will result in a smoother, more stable ride; on the flip side, the Infiniti FX50 may give a more maneuverable feel in daily traffic.
Cost
The destination charge is a standard charge for transporting the vehicle from its point of origin to the dealer. It costs about the same to get the Infiniti FX50 to the dealership as the HUMMER H2 SUT.
As far as MSRP, the Infiniti doesn't cost much less than the HUMMER.
Warranty
The basic after-sale protection that comes with the HUMMER H2 SUT isn't quite as generous as the Infiniti FX50's.