The biggest performance differences between the two tires could be found not off road, but on the street. While the Mud-Terrains were not at all objectionable, the All-Terrains felt smoother and quieter in all circumstances. The M/Ts were astonishingly quiet for a mud tire (especially compared to most other tires with such an aggressive tread), and only a little hum could be heard over the wind noise at speed. We did note a definite lug-thump that wasn't present with the All-Terrains as the truck slowed to a stop. On wet pavement, siping was sorely missed on the M/Ts, while the A/Ts felt as though they had more overall traction on both wet and dry roads.