What's the difference between a dually truck and a single wheel truck?

Other than the fact that a dually truck has more tires. I am thinking of buying a Ford truck when I save up enough money. I know that I am going to see single wheel and dually trucks. I am not looking for something made this year, I am looking at trucks between 1994 (because before 1994 Ford did not have airbags in trucks) and 2003 (my dad has a F350 2003 truck that he loves). I included that because I am sure that people are going to leave an answer that says "ford sucks", that is your opinion. I don't really like the newer Ford trucks. I got a friend who loves Chevy and hates Ford but we can still talk about trucks without a problem. I am not a huge fan of Chevy but I don't hate their vehicles. Back to the point of this question. Does a dually truck have more torque, power, better off-road? If dually's are better off-road then I would like to know this because I go offroad a lot. Thanks for whatever you can tell me.

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