Cost
The destination charge is a standard charge for transporting the vehicle from its point of origin to the dealer. The Mazda B2300 is significantly cheaper to get to the dealership than the GMC Sierra 2500HD.
With respect to MSRP, the GMC Sierra 2500HD costs tremendously more than the Mazda B2300.
Utility
Drivers with frequent kid-duty might favor the Sierra 2500HD over the B2300.
The GMC Sierra 2500HD is likely a better choice than the Mazda regarding transporting cargo, especially if you frequently need to carry a lot of gear or large pets.
The GMC Sierra 2500HD outpulls the Mazda B2300 by a sizeable margin.
Comfort
Taller drivers will significantly enjoy the extra head room in the GMC Sierra 2500HD's front cabin compared to the Mazda B2300.
Dimensions
The GMC Sierra 2500HD is tremendously heavier than the Mazda.
Your wallet will hurt more every time you fill up the Sierra 2500HD than the Mazda B2300 because of its larger tank.
The B2300 fits in smaller parking spaces than the GMC Sierra 2500HD.
The B2300's shorter wheelbase may produce a less-settled highway ride but a sprier feel in daily traffic than the GMC Sierra 2500HD.
Performance
With that kind of horsepower, the GMC Sierra 2500HD is a genuine sports car.
Handling
With its tighter turning radius, the Mazda is quite certainly nimbler than the GMC, something to consider if you do a lot of city driving; on the flip side, note that a vehicle with a tight turning circle may feel a bit twitchy on the highway.
Drivetrain
The GMC Sierra 2500HD's engine is tremendously more sizeable than the Mazda's. Note that more sizeable engines may use more gas than smaller ones.
Torque is roughly equivalent to acceleration, and in this respect, the GMC Sierra 2500HD is tremendously more powerful than the Mazda B2300.
The GMC Sierra 2500HD packs quite a punch compared to the Mazda B2300 with respect to torque, which is the force that lets you accelerate quickly.
Warranty
The GMC Sierra 2500HD and the B2300 have the same basic warranty.