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Are you torn between maximum towing capability and daily driving efficiency? If you are looking at the top-tier truck market for 2025, you are likely comparing the GMC Denali Ultimate trims. But the real question is under the hood: Do you need the "Big Diesel" or the "Small Diesel"?

We are breaking down the 2025 GMC Sierra 2500 Denali Ultimate with the 6.6L Duramax against the 2025 Sierra 1500 Denali Ultimate with the 3.0L Duramax. Both are luxurious, loaded with tech, and feature painted-to-match body accents for 2025, but they serve very different purposes.

When you’re looking at heavy-duty trucks, specifically the top-tier 2024 GMC Sierra Denali Ultimate, it can be incredibly difficult to tell the difference between a 2500 HD and a 3500 HD just by looking at them.

There is a ton of conflicting information out there regarding weights, specs, and capabilities. Are the brakes better on the one-ton? Does the 3500 have a bigger engine?

We have both trucks side-by-side to break down exactly what is the same, what is different mechanically, and most importantly, why those differences matter for your safety and legal liability when towing.