Handling
With its tighter turning radius, the Grand Vitara is quite certainly more agile than the Suzuki XL-7, something to consider if you do a lot of city driving; on the other hand, remember that a vehicle with a tight turning circle may feel a bit twitchy on the highway.
Drivetrain
The Grand Vitara and the Suzuki XL-7 have similar-sized engines, with a slight advantage to the Suzuki XL-7.
Torque is roughly equivalent to acceleration, and in this respect, the XL-7 is significantly more powerful than the Suzuki Grand Vitara.
Utility
The Suzuki XL-7 is a better choice than the Suzuki Grand Vitara regarding hauling capacity, especially if you often need to carry a lot of equipment or big dogs.
Drivers with frequent kid-duty might favor the Suzuki XL-7 over the Grand Vitara.
Towing is substantially more the Suzuki XL-7's forte than it is the Grand Vitara's.
Convenience
You'll doubtless take the Suzuki XL-7 for a fill-up about as often as the Suzuki Grand Vitara.
Comfort
While the front cabin in the XL-7 offers a bit more head room than the Suzuki Grand Vitara, there honestly isn't much of a difference.
While the rear of the XL-7 offers a bit more head- and leg-room than the Suzuki Grand Vitara, there really isn't much of a difference.
Dimensions
The Suzuki XL-7 is quite a bit heavier than the Grand Vitara.
The Suzuki Grand Vitara fits in smaller parking spaces than the Suzuki XL-7.
The Suzuki XL-7's longer wheelbase will result in a smoother, more stable ride; on the flip side, the Suzuki Grand Vitara may give a more agile feel in daily traffic.
Cost
There frankly isn't much of a difference in gas mileage here, but if you must know, the Suzuki Grand Vitara is a tad more economical than the Suzuki XL-7.
The Suzuki XL-7 is quite a bit more expensive than the Suzuki Grand Vitara with respect to MSRP.
Overview
The Suzuki Grand Vitara and the Suzuki XL-7 have the same basic warranty.
As far as warranty against rust, the Suzuki XL-7 and the Grand Vitara have the same coverage.
Other
The Suzuki XL-7 emits fewer smog-forming pollutants per 15,000 miles than the Suzuki Grand Vitara.