Handling
With its tighter turning radius, the Yukon Hybrid is most certainly more maneuverable than the HUMMER H2 SUV, something to consider if you do a lot of city driving; on the flip side, keep in mind that a vehicle with a tight turning circle may feel a bit twitchy on the highway.
Drivetrain
The GMC Yukon Hybrid's engine is slightly smaller than the HUMMER's, but not terribly so.
The GMC Yukon Hybrid could learn a lesson or two from the HUMMER H2 SUV with respect to torque.
Utility
Drivers with frequent child-duty might favor the GMC Yukon Hybrid over the H2 SUV.
The HUMMER is likely a better choice than the GMC regarding hauling capacity, especially if you often need to carry a lot of luggage or large dogs.
The H2 SUV outpulls the Yukon Hybrid by a large margin.
Comfort
While the front cabin in the GMC Yukon Hybrid offers a bit more head room than the HUMMER H2 SUV, there honestly isn't much of a difference.
The ampler interior dimensions of the HUMMER H2 SUV make it significantly more spacious for your passengers than the GMC.
Dimensions
The HUMMER H2 SUV is significantly heavier than the GMC Yukon Hybrid.
Your wallet will hurt more every time you fill up the HUMMER H2 SUV than the GMC Yukon Hybrid because of its bigger tank.
The HUMMER H2 SUV and the GMC Yukon Hybrid compete for the same parking spaces.
Cost
In terms of MSRP, the GMC Yukon Hybrid doesn't cost much less than the HUMMER H2 SUV.
Warranty
The basic warranty that comes with the GMC Yukon Hybrid isn't quite as generous as the HUMMER H2 SUV's.