Difference between 3G and Dual Mode?

When I go through cellular network options, I get 3 options as GSM, 3G and Dual Mode. What is the difference between the Dual Mode and 3G, and what exactly is this Dual Mode? When should I choose that over 3G?
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Dual mode means that the phone will connect to either 2G (GSM) or 3G connections. It will try for a 3G connection if it's strong enough, otherwise, it will go to a 2G connection.
The difference between 3G and dual mode, is in 3G mode, the phone will only try to connect to a 3G connection.
In most cases, dual would be better. If you are in an area will really strong and constitent 3G, then it's probably better to be on 3G.

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