Gas vs Diesel

What is better for mudding a Diesel truck or Gas?  

Its personal preference. And depends what you're driving. Diesel engine will give you more power, but it is usually accompanied by a heavier truck.  

Don't be confused by power and torque..... diesel engines produce more torque than horsepower where a gas engine will produce more equal amounts just at different rpm levels. I've seen both engines in mud boggers and I would have to say is go with a big block gas engine versus a small block. But to compare it to a diesel engine, it depends on what is done to it to broaden the rpm range. Mud boggers usually run higher rpms than a trail rig. But again, it depends on what you are using the truck for.......  

Diesel, it offers much more torque and fuel economy, they do require a different driving style and are much more resistant to water and soft mud with only minimal modifications. Engine revs are less important on diesels as the extra torque will pull you through a lot better than petrol, they just require gearchanges slightly less frequently due to the extra torque.