All-terrain tires are as they say for ALL types of terrain! They are not as aggressive as an MT. They have smaller tread blocks, a narrow void and less-robust internal construction. The tread on all-terrain tires is also permeated with sipes for traction, making them a great choice for wet, snowy or icy conditions. The tradeoff for off-road traction comes in a much smoother ride quality, better handling, tread life, noise level and traction in practically every other kind of conditions other than mud. Mud-terrain tires are specifically designed to be used when driving off-road, in jagged rocks, loose soil, mud or sand. Mud terrain tires feature larger treads and wider, deep gaps between them. This allows the tire to clear mud, gravel and debris as you drive.
Mud terrain tires are not meant to be driven on daily in most cases. Unfortunately, they tend to be noisy, rough, heavy, hard to balance.
All-terrain tires give up traction, with smaller tread blocks, narrower voids and less-robust internal construction and tread compounds. The tread on all-terrain tires is also permeated with sipes for traction, making them a great choice for wet, snowy or icy conditions were mud-terrain tires actually do not do well. The tradeoff for off-road traction comes in a much smoother ride quality, better handling, tread life, noise level and traction in practically every other kind of conditions other than mud.
If you do heavy off-roading, you will not be satisfied with all-terrain tires. They are the best option, for all-around on and off pavement back and forth travels. All the usual trips you would expect out of a light truck or SUV. If you expect to spend a lot of time playing in the mud, mud tires are about the only thing for that!