Cost
The destination charge is a standard charge for transporting the vehicle from its point of origin to the dealer. It costs almost the same to get the Dodge to the dealership as the GMC Sierra 3500HD.
In terms of MSRP, the Dodge Ram 1500 costs significantly less than the GMC Sierra 3500HD.
Utility
The GMC Sierra 3500HD's more sizeable trunk will accommodate more sizeable objects than the Dodge Ram 1500.
The Sierra 3500HD and the Ram 1500 can accommodate the same number of passengers.
The GMC Sierra 3500HD is a better choice than the Dodge Ram 1500 as far as hauling capacity, especially if you frequently need to carry a lot of suitcases or sizeable dogs.
The Sierra 3500HD outpulls the Ram 1500 by a sizeable margin.
Comfort
While the front cabin in the GMC Sierra 3500HD offers a bit more head room than the Dodge Ram 1500, there really isn't much of a difference.
The Ram 1500 offers more head- and leg-room to your passengers than the GMC Sierra 3500HD does.
Dimensions
The GMC Sierra 3500HD is tremendously heavier than the Dodge.
The Dodge Ram 1500's tank is roughly the same size as the GMC Sierra 3500HD's, though the GMC Sierra 3500HD's is a tad larger.
The Dodge Ram 1500 and the GMC Sierra 3500HD compete for the same parking spaces.
The Sierra 3500HD's longer wheelbase will result in a smoother, more stable ride; on the flip side, the Dodge may give a nimbler feel in daily traffic.
Performance
With that kind of horsepower, both the GMC Sierra 3500HD and the Dodge Ram 1500 are true speedsters.
Handling
With its tighter turning circle, the Dodge Ram 1500 is definitely sprier than the GMC Sierra 3500HD, 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 GMC Sierra 3500HD's engine is tremendously larger than the Ram 1500's. Note that bigger engines may use more gasoline than smaller ones.
The GMC packs quite a punch compared to the Dodge as far as torque, which is roughly equivalent to acceleration.
Overview
The Dodge Ram 1500 and the GMC Sierra 3500HD have the same basic warranty.