I don't know why a lot of people try to avoid a 2500 series truck. They are basically the same size, shape, etc. They interior is generally identical. They have all the same controls, etc.
The 2500 will generally get you a stronger frame, stronger axles, heavier duty springs, bigger engine, bigger brakes, stronger u-joints in the drive shafts, higher towing capacity, higher payload capacity, and often a stronger transmission. That's a lot of additional capability for not very much additional investment, particularly when looking for used trucks.