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It really depends on the setup and the task. Two wheel is very effective with tracks (only power two of the wheels in the tracks) and wide wheels. They are good at manuevering and can be extremely good at pushing and whatnot. However, two wheel drive is very difficult to handle with larger diameter and narrower wheels. For that situation four wheel drive is extremely powerful and offers good agility.
Summarizing what i just said....depends on the situation....
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